- 220 (number)
It is a
composite number, with its divisors being 1, 2, 4, 5, 10, 11, 20, 22, 44, 55 and 110, making it an amicable numberwith 284. [Bryan Bunch, "The Kingdom of Infinite Number". New York: W. H. Freeman & Company (2000): 167] Also, being divisible by the sum of its digits, 220 is a Harshad number.
It is the sum of four consecutive primes (47 + 53 + 59 + 61).
It is a
tetrahedral number, the sum of the first ten triangular numbers.
In other fields
The number 220 can also refer to:
* The year
220AD or 220 BC.
* A common
voltage in many countries.
* In the
Bible, the number of goats Jacob gave to his brother Esau ("two hundred she-goats and twenty he-goats") and the number of sheep ("two hundred ewes and twenty rams," Genesis 32:14).
* An SMTP code meaning "service ready"
* A film format for medium format cameras (see
220 (t.A.T.u. song), a single by music duo t.A.T.u..
* An album by guitarist
* Wells, D. (1987). "The Penguin Dictionary of Curious and Interesting Numbers" (pp. 145 - 147). London: Penguin Group.
Two hundred twenty-onehas its own article.---- Two hundred twenty-twohas its own article.---- Two hundred twenty-threehas its own article.
Two hundred twenty-three 223 prime, sum of three consecutive primes (71 + 73 + 79), sum of seven consecutive primes (19 + 23 + 29 + 31 + 37 + 41 + 43), smallest number requiring 37 fifth powers for Waring representation (see
Waring's problem), strictly non-palindromic number; also the number of United Nationsresolution 223, regarding the treatment of Israel, and the flight number of a British Airwaysplane believed targeted for the symbolism of its number----Two hundred twenty-four 224 = 25·7, Harshad number, Zuckerman number----Two hundred twenty-five 225 = 32·52 = 152, refactorable number, octagonal number, centered octagonal number, sum of the cubes of the first five integers, Harshad number, number of squares on a Scrabbleboard.----Two hundred twenty-six 226 = 2·113, centered pentagonal number.---- Two hundred twenty-sevenhas its own article.
Two hundred twenty-seven 227 prime,
safe prime, twin primewith 229, Chen prime, Eisenstein primewith no imaginary part, also the name of a TV show starring Marla Gibbsand Hal Williams----Two hundred twenty-eight 228 = 22·3·19, sum of six consecutive primes (29 + 31 + 37 + 41 + 43 + 47), sum of ten consecutive primes (7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37 + 41), refactorable number, Harshad number, repdigitin base 7 (444).
228 Incident---- Two hundred twenty-ninehas its own article.
Two hundred twenty-nine 229 prime,
twin primewith 227
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