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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
"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. 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 0â€“9 and Aâ€“F, or aâ€“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 Ïƒ(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 Ïƒ0(n) up to n=250 Sigma function Ïƒ1(n) up to n=250 Sum of the squares of divisors, Ïƒ2(n), up to n=250 Sum of cubes of divisors, Ïƒ3(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 Ïƒ(n) = Ïƒ1(n) to be the divisor function normally, then, the aliquot sequence of k can be written: s0 = k sn = Ïƒ(snâˆ’1) âˆ’ snâˆ’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). ... Â£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 nÂ² 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 Â· 320 Â· 59 Â· 76 Â· 112 Â· 133 Â· 17 Â· 19 Â· 23 Â· 29 Â· 31 Â· 41 Â· 47 Â· 59 Â· 71 = 808017424794512875886459904961710757005754368000000000 â‰ˆ 8 Â· 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.

## 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 (× Ö°×—Ö¶×žÖ°×™Ö¸×” Comforted of/is the LORD (YHWH), Standard Hebrew NÉ™á¸¥emya, Tiberian Hebrew NÉ™á¸¥emyÄh, ) 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. ...

## 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. ... Results from FactBites:

 Number 20 Limited - Total Travel Management Solutions (856 words) Number 20 Ltd are able to source equipment specialists, guest speakers and outdoor pursuit experts all to help bring your ideas to a successful event. Number 20 Ltd invite you to consider the team at Number 20 to be an extension of your own department. Number 20 Ltd work with clients on the understanding that each one is unique, with their own set of needs, priorities and expectations.
 20 (number) - definition of 20 (number) in Encyclopedia (575 words) Twenty is a composite number, its proper divisors being 1, 2, 4, 5 and 10. The number of proteinogenic amino acids that are encoded by the standard genetic code. The number 20 is used as an index in measuring visual acuity.
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