24 (number)

Summary

24 (twenty-four) is the natural number following 23 and preceding 25. It is equal to two dozen and one sixth of a gross.

← 23 24 25 →
Cardinaltwenty-four
Ordinal24th
(twenty-fourth)
Numeral systemtetravigesimal
Factorization23 × 3
Divisors1, 2, 3, 4, 6, 8, 12, 24
Greek numeralΚΔ´
Roman numeralXXIV
Binary110002
Ternary2203
Senary406
Octal308
Duodecimal2012
Hexadecimal1816

In mathematics

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24 is an even composite number, a highly composite number, an abundant number, a practical number, and a congruent number.

24 is also part of the only nontrivial solution pair to the cannonball problem,[1] and the kissing number in 4-dimensional space. An icositetragon is a regular polygon with 24 sides. A tesseract has 24 two-dimensional square faces.

In science

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In religion

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In music

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In sports

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In other fields

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Astronomical clock in Prague

24 is also:

  • The number of bits a computer needs to represent 24-bit color images (for a maximum of 16,777,216 colours—but greater numbers of bits provide more accurate colors).
  • The number of karats representing 100% pure gold.[4]
  • The number of cycles in the Chinese solar year.
  • The number of years from the start of the Cold War until the signing of the Seabed Arms Control Treaty, which banned the placing of nuclear weapons on the ocean floor within certain coastal distances.
  • The number of frames per second at which motion picture film is usually projected, as this is sufficient to allow for persistence of vision.
  • The number of letters in both the modern and classical Greek alphabet.[5] For the latter reason, also the number of chapters or "books" into which Homer's Odyssey and Iliad came to be divided.
  • The number of runes in the Elder Futhark.
  • The number of points on a backgammon board.[6]
  • A children's mathematical game involving the use of any of the four standard operations on four numbers on a card to get 24 (see 24 Game).
  • The maximum number of Knight Companions in the Order of the Garter.
  • The number of the French department Dordogne.
  • Four and twenty is the number of blackbirds baked in a pie in the traditional English nursery rhyme "Sing a Song of Sixpence".
  • In Brazil, twenty-four is associated with homosexuality as it is the number that stands for the deer in a game known as “jogo do bicho”.

References

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  1. ^ Weisstein, Eric W. "Cannonball Problem". mathworld.wolfram.com. Retrieved 2020-08-19.
  2. ^ Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; Bièvre, Paul De; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna; Loss, Robert D.; Walczyk, Thomas; Prohaska, Thomas (2016-03-01). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265–291. doi:10.1515/pac-2015-0305. hdl:11858/00-001M-0000-0029-C3D7-E. ISSN 0033-4545. S2CID 101719914.
  3. ^ "Revelation 4:4, New International Version (1984)". Bible.cc. Retrieved 2013-05-03.
  4. ^ "Is 24K gold pure?". Scientific American. Retrieved 2020-08-12.
  5. ^ "Greek alphabet | History, Definition, & Facts". Encyclopedia Britannica. Retrieved 2020-08-12.
  6. ^ "GammonSite - Rules of backgammon". www.gammonsite.com. Retrieved 2020-08-12.
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