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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" in countries using the Imperial system. (The metric equivalent is 6/6.)
Learn about the properties, factors, and uses of the number 20 in different systems and languages. Find out why 20 is an abundant number, a base 20 system, and a polyhedron.
Dec 3, 2015 · Answer link. 20! = 20 xx 19 xx 18 xx ... xx 2 xx 1 = 2432902008176640000 ~~ 2.4329 xx 10^18 n! grows a little bit faster than sqrt (n^n), but slower than n^n.
Jun 12, 2024 · Twenty is the number that is after nineteen and before twenty-one. The prime factors of twenty are 2 and 5. (2 * 2 * 5 = 20) Its factors are: 1, 2, 4, 5, 10, and 20. As the sum of its factors is more than itself (i.e. 22), it can be referred to as an abundant number. 20 can been used as a number base.
WATCH FULL EPISODES OF 20/20: ON ABC: https://bit.ly/2I7lecx ON HULU: https://hulu.tv/2XHutFU Visit 20/20 on ABCNews.com https://abcnews.go.com/2020 #ABC2020.
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Learn the definition, pronunciation and usage of the number 20 in English. See examples, synonyms, translations and related words for twenty.
