20 (number)

Twenty directs here. This article is relating to number 20. For the year, to see 20.

20 (twenty) is the Entier naturalness which follows 19 and which precedes 21. It is a number Pair. It can be written twenty in certain cases.

In Mathematical, 20 is a made up Nombre, its own dividers being 1, 2, 4, 5 and 10.

20 is the sum of the 4 first triangular numbers, which makes a tetrahedral Nombre of it. It is a Nombre Harshad, a oblong Nombre and a Auto number.

20 is also the full number of fingers for an human body, which in fact a possible candidate for a numbering system, known as “vigesimal”. The expression “ Eighty ”, used in France, could come from it. In the old monetary system of the the United Kingdom, a book was consituée of 20 Shilling S.

A Polyèdre with 20 faces is a Icosaèdre.

Twenty are the first number in a magic square remote Hindu of order 3.

In other fields

In the Anglo-Saxon countries, number 20 is used like index to measure the Vision. 20/20 indicates a normal vision to 20 feet, although it is commonly used to mean “perfect vision”. When somebody is able to see only after one event which has just occurred, this person is often known as to have one “20/20 retrospective”.

Twenty years is the age of the majority in the tradition Japan ease. Somebody who is twenty years old exactly is called a hatachi .

“The twenty years curse” refers to the repetition of dead President of the United States elected died in its office at twenty years of interval starting in 1840. This repetition failed when Reagan survived its mandate.

A group of twenty units often refers to a score .

A survival curious about the Celtic Langues is preserved in the folklore of the north of the England; it is called the “Score of the Lincolnshire” or the score of Shepherd (shepherd). It is a marking in stick which counts twenty unit by using a rate/rhythm:

Yan, tan, will tethera, pethera, pimp,

will sethera, lethera, hovera, dovera, dick,

yanadick, tanadick, tetheradick, petheradick, bumfit,

yanabumfit, tanabumfit, tetherabumfit, petherabumfit, jiggit.

There exist several alternatives, but all use similar words for at least the first five units, and for the principle of counting of the last five by their additions with fifteen, as it is made in the Celtic dialects. To compare the Score with the numbers of the Celtic languages, to see the Numbers in the various languages.

20 is:

the Amino-acid numbers of which are encodés by the standard genetic code.
the Atomic number of the Calcium, a alkaline-earth Metal.
the magic third Number (physical).
denomination of the American dollar where figure the portrait of Andrew Jackson.
In the constitution of the the United States, 20 $ is the threshold value for the civil conflicts above which the right of a lawsuit per jury is respected.
a child has 20 teeth.
the international telephone indicative to call the Egypt.
historical Years: -20, 20 or 1920.
the n° of the French Department, the Corsica . Subdivided in 1976 in 2A (Corse-du-Sud) and 2B (Haute-Corse).
the number of years of Marriage of the weddings of Porcelain.
the number of the French highway A20 which leaves the A71 to the height of Vierzon to reach the A62 with the height of Montauban. It is called the occitane .
the number of possible blows in opening of part of failures.
the number of districts of the town of Paris.

See too

GS 20 is a gene sequencer built by 454 Life Sciences.

External bonds

Almanac and dictionary of the numbers (site of Gerard Villemin)
Wiktionnaire

Ru-sib: 20 (число)

Simple: Twenty Zh-yue: 20

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