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Encyclopedia > 20 (number)
20

20 21 22 23 24 25 26 27 28 29 19 (nineteen) is the natural number following 18 and preceding 20. ... 21 (twenty-one) is the natural number following 20 and preceding 22. ... 19 (nineteen) is the natural number following 18 and preceding 20. ... 21 (twenty-one) is the natural number following 20 and preceding 22. ... 22 (twenty-two) is the natural number following 21 and preceding 23. ... 23 (twenty-three) is the natural number following 22 and preceding 24. ... 24 (twenty-four) is the natural number following 23 and preceding 25. ... 25 (twenty-five) is the natural number following 24 and preceding 26. ... 26 (twenty-six) is the natural number following 25 and preceding 27. ... 27 (twenty-seven) is the natural number following 26 and preceding 28. ... 28 (twenty-eight) is the natural number following 27 and preceding 29. ... 29 (twenty-nine) is the natural number following 28 and preceding 30. ... 30 (thirty) is the natural number following 29 and preceding 31. ...

List of numbersIntegers This is a list of articles about numbers (not about numerals). ... Not to be confused with Natural number. ...

0 10 20 30 40 50 60 70 80 90 Zero redirects here. ... This article is about the number 10. ... 30 (thirty) is the natural number following 29 and preceding 31. ... 40 (forty) is the natural number following 39 and preceding 41. ... 50 (fifty) is the number following 49 and preceding 51. ... 60 (sixty) is the natural number following 59 and preceding 61. ... Look up seventy in Wiktionary, the free dictionary. ... 80 (eighty) is the natural number following 79 and preceding 81. ... 90 (ninety) is the natural number preceded by 89 and followed by 91. ... 100 (one hundred) (the Roman numeral is C for centum) is the natural number following 99 and preceding 101. ...

Cardinal twenty
Ordinal 20th
(twentieth)
Numeral system vigesimal
Factorization 2^2 cdot 5
Divisors 1, 2, 4, 5, 10, 20
Roman numeral XX
Binary 101002
Octal 248
Duodecimal 1812
Hexadecimal 1416
"Twenty" redirects here. For the village in England, see Twenty, Lincolnshire.

20 (twenty) is the natural number following 19 and preceding 21. A group of twenty units may also be referred to as a score.[1] Aleph-0, the smallest infinite cardinal In mathematics, cardinal numbers, or cardinals for short, are generalized numbers used to measure the cardinality (size) of sets. ... In linguistics, ordinal numbers are the words representing the rank of a number with respect to some order, in particular order or position (i. ... This article is about different methods of expressing numbers with symbols. ... The vigesimal or base-20 numeral system is based on twenty (in the same way in which the ordinary decimal numeral system is based on ten). ... ... In mathematics, a divisor of an integer n, also called a factor of n, is an integer which evenly divides n without leaving a remainder. ... The system of Roman numerals is a numeral system originating in ancient Rome, and was adapted from Etruscan numerals. ... The binary numeral system, or base-2 number system, is a numeral system that represents numeric values using two symbols, usually 0 and 1. ... The octal numeral system, or oct for short, is the base-8 number system, and uses the digits 0 to 7. ... The duodecimal (also known as base-12 or dozenal) system is a numeral system using twelve as its base. ... In mathematics and computer science, hexadecimal, base-16, or simply hex, is a numeral system with a radix, or base, of 16, usually written using the symbols 0–9 and A–F, or a–f. ... For other uses, see England (disambiguation). ... Twenty is a small, somewhat remote hamlet with an unusual name, four miles east of the market town of Bourne, (between Bourne and Spalding) in Lincolnshire, England, at National Grid reference TF153207, 52. ... In mathematics, a natural number can mean either an element of the set {1, 2, 3, ...} (i. ... 19 (nineteen) is the natural number following 18 and preceding 20. ... 21 (twenty-one) is the natural number following 20 and preceding 22. ...

Look up twenty in
Wiktionary, the free dictionary.

Contents

Wiktionary (a portmanteau of wiki and dictionary) is a multilingual, Web-based project to create a free content dictionary, available in over 151 languages. ...

In mathematics

Twenty is a composite number, its proper divisors being 1, 2, 4, 5 and 10. Skipping 2 and adding the other divisors gives 20, hence 20 is a semiperfect number, and since it is not divisible by any of the smaller semiperfect numbers, it is a primitive semiperfect number. 20 is the smallest abundant number that is not a multiple of 3. A composite number is a positive integer which has a positive divisor other than one or itself. ... In mathematics, a divisor of an integer n, also called a factor of n, is an integer which evenly divides n without leaving a remainder. ... One redirects here. ... For other uses of 2, see 2 (disambiguation). ... Look up four in Wiktionary, the free dictionary. ... Look up five in Wiktionary, the free dictionary. ... This article is about the number 10. ... In mathematics, a semiperfect number or pseudoperfect number is a natural number n that is equal to the sum of all or some of its proper divisors. ... In mathematics, a primitive semiperfect number (also called a primitive pseudoperfect number, irreducible semiperfect number or irreducible pseudoperfect number) is a natural number that has no semiperfect proper divisor. ... In mathematics, an abundant number or excessive number is a number n for which σ(n) > 2n. ...


20 is the second positive integer with a prime factorization of the form 2^2 cdot q, where q is a prime. Its aliquot sum is 22, and its aliquot sequence is (20,22,14,10,8,7,1,0). Divisor function σ0(n) up to n=250 Sigma function σ1(n) up to n=250 Sum of the squares of divisors, σ2(n), up to n=250 Sum of cubes of divisors, σ3(n) up to n=250 In mathematics, and specifically in number theory, a divisor function is... In mathematics, an aliquot sequence is a recursive sequence which can be defined in the following way: if we write σ(n) = σ1(n) to be the divisor function normally, then, the aliquot sequence of k can be written: s0 = k sn = σ(sn−1) − sn−1 For example, the aliquot sequence...


It is also the sum of the first four triangular numbers, making it a tetrahedral number. A triangular number is the sum of the n natural numbers from 1 to n. ... A pyramid with side length 5 contains 35 spheres. ...


20 is the total number of digits on the human body, which makes it a convenient number system radix; such number systems are called vigesimal. In the former British currency system, there were twenty shillings in a pound. The radix (Latin for root), also called base, is the number of various unique symbols (or digits or numerals) a positional numeral system uses to represent numbers. ... The vigesimal or base-20 numeral system is based on twenty (in the same way in which the ordinary decimal numeral system is based on ten). ... £sd (pronounced, and sometimes written, LSD) was the popular name for the pre-decimal currencies used in the United Kingdom, and in most of its Empire and colonies. ... This article is about coinage. ... GBP redirects here. ...


A polyhedron with twenty faces is an icosahedron. For the game magazine, see Polyhedron (magazine). ... [Etymology: 16th century: from Greek eikosaedron, from eikosi twenty + -edron -hedron], icosahedral adjective An icosahedron noun (plural: -drons, -dra ) is any polyhedron having 20 faces, but usually a regular icosahedron is implied, which has equilateral triangles as faces. ...


Twenty is the first number in an early Indian magic square of order 3. In recreational mathematics, a magic square of order n is an arrangement of n² numbers, usually distinct integers, in a square, such that the n numbers in all rows, all columns, and both diagonals sum to the same constant. ...


In base 10, it is a Harshad number and the smallest even self number. A Harshad number, or Niven number, is an integer that is divisible by the sum of its digits in a given number base. ... A self number or Colombian number is an integer which, in a given base, can not be generated by any other integer added to the sum of its digits. ...


The Monster group contains 20 sporadic groups. In mathematics, the Monster group M is a group of order    246 · 320 · 59 · 76 · 112 · 133 · 17 · 19 · 23 · 29 · 31 · 41 · 47 · 59 · 71 = 808017424794512875886459904961710757005754368000000000 ≈ 8 · 1053. ... In the mathematical field of group theory, a sporadic group is one of the 26 exceptional groups in the classification of finite simple groups. ...


In science

See also: List of elements by atomic number In chemistry and physics, the atomic number (also known as the proton number) is the number of protons found in the nucleus of an atom. ... For other uses, see Calcium (disambiguation). ... For other uses of the term, see magic number. ...

Biology

  • The number of proteinogenic amino acids that are encoded by the standard genetic code.
  • In some countries, the number 20 is used as an index in measuring visual acuity. 20/20 indicates normal vision at 20 feet, although it is commonly used to mean "perfect vision" (Note that this applies only to countries using the Imperial system. The metric equivalent is 6/6). When someone is able to see only after an event how things turned out, that person is often said to have had "20/20 hindsight".
  • There are 20 baby teeth in the deciduous dentition.

The twenty amino acids that are coded in the standard genetic code are called proteinogenic (protein building). ... This article is about the class of chemicals. ... Traditional Snellen chart used for visual acuity testing. ... This article is about post-1824 imperial units, see also English unit, U.S. customary units or Avoirdupois. ... ...

In religion

In the Jewish tradition, a Levite (לוי Attached, Standard Hebrew Levi, Tiberian Hebrew Lēwî) is a member of the Hebrew tribe of Levi. ... This page is about the Biblical king David. ... The Temple in Jerusalem or Holy Temple (Hebrew:  ; The Holy House), refers to a series of structures located on the Temple Mount (Har HaBayit) in the old city of Jerusalem. ... The Book of Chronicles is a book in the Hebrew Bible (also see Old Testament). ... For other uses, see Ezra (disambiguation). ... Nehemiah or Nechemya (נְחֶמְיָה Comforted of/is the LORD (YHWH), Standard Hebrew Nəḥemya, Tiberian Hebrew Nəḥemyāh, ) is a major figure in the post-exile history of the Jews as recorded in the Bible, and is believed to be the primary author of the Book of Nehemiah. ... For other uses, see Babylonian captivity (disambiguation). ... In the Jewish tradition, a Levite (לוי Attached, Standard Hebrew Levi, Tiberian Hebrew Lēwî) is a member of the Hebrew tribe of Levi. ... The Book of Ezra is a book of the Bible in the Old Testament and Hebrew Tanakh. ...

In sports

The Pro Football Hall of Fame is the hall of fame of the National Football League (NFL). ... Barry David Sanders (born July 16, 1968)) is a Hall of Fame and Heisman Trophy winning American football running back who spent all of his professional career with the Detroit Lions in the NFL. Sanders is best known for being one of the most prolific running backs in NFL history... City Detroit, Michigan Team colors Honolulu Blue, Silver, and Black Head Coach Rod Marinelli Owner William Clay Ford, Sr. ... This article is about the baseball player and manager. ... Michael Jack Schmidt (born September 27, 1949 in Dayton, Ohio) is a former American professional baseball player who played his entire career for the Philadelphia Phillies. ... Mark Steven The Bird Fidrych (born August 14, 1954 in Worcester, Massachusetts) was a Major League Baseball player for the Detroit Tigers. ... Louis Clark Lou Brock (born June 18, 1939, El Dorado, Arkansas) is an American former player in Major League Baseball. ... For other persons named Tony Stewart, see Tony Stewart (disambiguation). ... Jeff Burton (99), Elliott Sadler (38), Ricky Rudd (21), Dale Jarrett (88), Sterling Marlin (40), Jimmie Johnson (48), and Casey Mears (41) practice for the 2004 Daytona 500 The National Association for Stock Car Auto Racing (NASCAR) is the largest sanctioning body of motorsports in the United States. ... The National Association for Stock Car Auto Racing (NASCAR) is the largest sanctioning body of motorsports in the United States. ... Twenty20 is a form of cricket, originally introduced in the United Kingdom for professional inter-county competition by the England and Wales Cricket Board (ECB), in 2003. ... This article is about the sport. ... In the sport of cricket, an over is a set of six consecutive balls bowled in succession. ... NFL logo For other uses of the abbreviation NFL, see NFL (disambiguation). ... For other persons of the same name, see Edward Reed. ... Jamael Orondé Rondé Barber (pronounced ) (born April 7, 1975 in Blacksburg, Virginia) is an American football player who currently plays cornerback for the Tampa Bay Buccaneers of the NFL. He is the identical twin brother of former New York Giants running back Tiki Barber. ... Brian Patrick Dawkins Sr. ... The National Basketball Association of the United States and Canada, commonly known as the NBA, is the premier professional basketball league in North America. ... Emanuel David Ginobili (Spanish: Ginóbili) (born July 28, 1977 in Bahía Blanca, Argentina), better known as Manu Ginobili, is an Argentine basketball player of Italian descent. ... The San Antonio Spurs are an American professional basketball team based in San Antonio, Texas. ... The National Basketball Association of the United States and Canada, commonly known as the NBA, is the premier professional basketball league in North America. ... Bob Cousy Point guard (PG), also called the one or the ball-handler, is one of the standard positions in a regulation basketball game. ... This article is about the basketball player. ... The Seattle SuperSonics (also called the Seattle Sonics) are an American professional basketball team based in Seattle, Washington. ... Soccer redirects here. ... Ole Gunnar Solskjær (born 26 February 1973 in Kristiansund, Norway) is a former Norwegian footballer who spent the vast majority of his career playing for Manchester United. ... MUFC redirects here. ... Major league affiliations American League (1901–present) East Division (1969–present) Current uniform Retired Numbers 1, 3, 4, 5, 7, 8, 8, 9, 10, 15, 16, 23, 32, 37, 44, 49 Name New York Yankees (1913–present) New York Highlanders (1903-1912) Baltimore Orioles (1901-1902) (Also referred to as... Jorge Rafael Posada Villeta (born August 17, 1971 in Santurce, Puerto Rico) is a switch-hitting catcher and 6-time All Star who plays for the New York Yankees. ... This article is about the player in baseball. ... This article is about the sport. ... Henry Ludwig Hank Borowy (May 12, 1916 - August 23, 2004) was a Major League Baseball right-handed starting pitcher who played for the New York Yankees (1942-45), Chicago Cubs (1945-48), Philadelphia Phillies (1949-50), Pittsburgh Pirates (1950) and Detroit Tigers (1950-51). ... Major league affiliations American League (1901–present) East Division (1969–present) Current uniform Retired Numbers 1, 3, 4, 5, 7, 8, 8, 9, 10, 15, 16, 23, 32, 37, 44, 49 Name New York Yankees (1913–present) New York Highlanders (1903-1912) Baltimore Orioles (1901-1902) (Also referred to as... The following are the baseball events of the year 1945 throughout the world. ... A waiver is the voluntary relinquishment or surrender of some right or privilege. ... Major league affiliations National League (1876–present) Central Division (1994–present) Current uniform Retired Numbers 10, 14, 23, 26, 42 Name Chicago Cubs (1902–present) Chicago Orphans (1898-1901) Chicago Colts (1890-1897) Chicago White Stockings (1870-1871, 1874-1889) (a. ... For other events named World Series, see World Series (disambiguation). ... Zbigniew Boniek (IPA: ) (born March 3, 1956 in Bydgoszcz) is a famous Polish football player. ... This article is about the goaltender in ice hockey. ... Evgeni Viktorovich Nabokov (Russian: ) (born July 25, 1975 in Ust-Kamenogorsk, U.S.S.R., now Kazakhstan), is a professional ice hockey goaltender for the San Jose Sharks of the National Hockey League. ... The San Jose Sharks are a professional ice hockey team based in San Jose, California, United States. ... Anderson Luis de Souza, OIH (born August 27, 1977 in São Bernardo do Campo, Brazil) is a professional Portuguese Brazilian footballer widely known as Deco [Portuguese]. He plays internationally for Portugal and for FC Barcelona at club level. ...

In other fields

20 is: For other uses, see Abraham Lincoln (disambiguation). ... The only confirmed photo of Abraham Lincoln at Gettysburg (seated), taken about noon, just after Lincoln arrived and some three hours before he spoke. ... This article is about the Western board game. ... Twenty Questions was a popular radio and television quiz series based on the spoken parlor game which encourages deductive reasoning and creativity. ... For the 1970s Canadian TV game show, see Party Game (game show). ... The age of majority is the threshold of adulthood as it is conceptualized in law. ... The term Tecumsehs curse or Zero Year Curse is sometimes used to describe a chain of events that began with the death of United States President William Henry Harrison from pneumonia. ... Federal courts Supreme Court Circuit Courts of Appeal District Courts Elections Presidential elections Midterm elections Political Parties Democratic Republican Third parties State & Local government Governors Legislatures (List) State Courts Local Government Other countries Atlas  US Government Portal      For other uses, see President of the United States (disambiguation). ... 1840 is a leap year starting on Wednesday (link will take you to calendar). ... 1860 is the leap year starting on Sunday. ... Year 1880 (MDCCCLXXX) was a leap year starting on Thursday (link will display the full calendar) of the Gregorian calendar (or a leap year starting on Tuesday of the 12-day slower Julian calendar). ... Äž: For the film, see: 1900 (film). ... Year 1920 (MCMXX) was a leap year starting on Thursday (link will display 1920) of the Gregorian calendar. ... Year 1940 (MCMXL) was a leap year starting on Monday (link will display the full 1940 calendar) of the Gregorian calendar. ... Year 1960 (MCMLX) was a leap year starting on Friday (link will display full calendar) of the Gregorian calendar. ... Year 1980 (MCMLXXX) was a leap year starting on Tuesday (link displays the 1980 Gregorian calendar). ... Reagan redirects here. ... Matchbox Twenty (or MB20, MBT, M20, originally spelt Matchbox 20) is a rock band formed in Orlando, Florida. ... This article is about the film studio. ... Yan Tan Tethera was a traditional numeric jargon used by shepherds to count sheep in northern England and southern Scotland. ... Species See text. ... This article is about the television show. ... The American Broadcasting Company (ABC) is an American television network. ... Barbara Jill Walters[2] (born September 25, 1929) is an American journalist, writer, and media personality who has been a regular fixture on morning television shows (Today and The View), an evening news magazine (20/20), and on The ABC Evening News as the first female evening news anchor. ... Hugh Malcolm Downs (born February 14, 1921) is a retired American broadcaster, television host, producer, and author. ... Elizabeth Vargas Elizabeth Vargas (born September 6, 1962 in Paterson, New Jersey) is a television journalist, currently co-anchor of ABCs television newsmagazine 20/20 and anchor of ABC News Specials. ... The original Dungeons & Dragons set Dungeons & Dragons (abbreviated as D&D or DnD) is a fantasy role-playing game (RPG) published by Gary Gygax and David Arneson in January 1974. ... This article is about the economic term. ...

Twenty is a small, somewhat remote hamlet with an unusual name, four miles east of the market town of Bourne, (between Bourne and Spalding) in Lincolnshire, England, at National Grid reference TF153207, 52. ... Masouleh village, Gilan Province, Iran. ... For other places with the same name, see Lincolnshire (disambiguation). ... Wikisource has original text related to this article: The United States Constitution The United States Constitution is the supreme law of the United States of America. ... USD redirects here. ... For other uses, see Andrew Jackson (disambiguation). ... GBP redirects here. ... For other persons named Adam Smith, see Adam Smith (disambiguation). ... This is a list of country calling codes, also known as international direct dialing (IDD) codes, which are needed to access international telephone services. ... “I-20” redirects here. ... For other uses, see Texas (disambiguation). ... Official language(s) English Capital Columbia Largest city Columbia Largest metro area Columbia Area  Ranked 40th  - Total 34,726 sq mi (82,965 km²)  - Width 200 miles (320 km)  - Length 260 miles (420 km)  - % water 6  - Latitude 32° 2′ N to 35° 13′ N  - Longitude 78° 32′ W to 83... 20 is an album Harry Connick, Jr. ... Year 1988 (MCMLXXXVIII) was a leap year starting on Friday (link displays 1988 Gregorian calendar). ... An album or record album is a collection of related audio or music tracks distributed to the public. ... ‹ The template below (Taginfo) is being considered for deletion. ... Twenty is a 1997 album by the post-crash lineup of Lynyrd Skynyrd. ... For the band, see 1997 (band). ... An album or record album is a collection of related audio or music tracks distributed to the public. ... Lynyrd Skynyrd (pronounced lÄ•h-nérd skin-nérd) (pronounced ) is an iconic U.S. Southern rock band. ... 20 is the eleventh album by Estonian rock band Terminaator, released in 2007. ... Year 2007 (MMVII) was a common year starting on Monday of the Gregorian calendar in the 21st century. ... An album or record album is a collection of related audio or music tracks distributed to the public. ... Terminaator is a Estonian rock group made in 1987 by Jaagup Kreem. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... For other uses, see Concert (disambiguation). ... Regina Encarnacion Ansong Velasquez (born April 22, 1970) is a Filipino singer, actress, record producer, and TV host. ... CB slang (commonly called CB Talk) are terms that those operating CB radio used mainly during the CB craze of the 1970s and 1980s. ... This article is about the File Transfer Protocol standardised by the IETF. For other file transfer protocols, see File transfer protocol (disambiguation). ...

Historical years

20 A.D., 20 B.C., 1920, 2020, etc. Events Roman Empire Tiberias is built on the Sea of Galilee by Herod Antipas, in honour of Tiberius. ... Centuries: 2nd century BC - 1st century BC - 1st century Decades: 70s BC 60s BC 50s BC 40s BC 30s BC - 20s BC - 10s BC 0s 10s 20s 30s Years: 25 BC 24 BC 23 BC 22 BC 21 BC 20 BC 19 BC 18 BC 17 BC 16 BC 15... Year 1920 (MCMXX) was a leap year starting on Thursday (link will display 1920) of the Gregorian calendar. ... 2020 (MMXX) will be a leap year starting on Wednesday of the Gregorian calendar. ...


References

  1. ^ John H. Conway and Richard K. Guy, The Book of Numbers. New York: Copernicus (1996): 11. ""Score" is related to "share" and comes from the Old Norse "skor" meaning a "notch" or "tally" on a stick used for counting. ... Often people counted in 20s; every 20th notch was larger, and so "score" also came to mean 20."

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The number of proteinogenic amino acids that are encoded by the standard genetic code.
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