- 220 (number)
**220**("two hundred [and] twenty") is thenatural number following 219 and preceding 221.**In mathematics**It is a

composite number , with its divisors being 1, 2, 4, 5, 10, 11, 20, 22, 44, 55 and 110, making it anamicable number with 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 aHarshad number .It is the sum of four consecutive primes (47 + 53 + 59 + 61).

It is a

tetrahedral number , the sum of the first tentriangular number s.**In other fields**The number 220 can also refer to:

* The year220 AD or220 BC .

* A commonvolt age in many countries.

* In theBible , 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 (see120 film ).

*220 (t.A.T.u. song) , a single by music duot.A.T.u. .

* An album by guitaristPhil Keaggy .**References*** Wells, D. (1987). "The Penguin Dictionary of Curious and Interesting Numbers" (pp. 145 - 147). London: Penguin Group.

**221-229**Two hundred twenty-one has its own article.----Two hundred twenty-two has its own article.----Two hundred twenty-three has 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 ofUnited Nations resolution 223, regarding the treatment ofIsrael , and the flight number of aBritish Airways plane believed targeted for the symbolism of its number----Two hundred twenty-four 224 = 2^{5}·7, Harshad number,Zuckerman number ----Two hundred twenty-five 225 = 3^{2}·5^{2}= 15^{2}, refactorable number,octagonal number ,centered octagonal number , sum of the cubes of the first five integers, Harshad number, number of squares on aScrabble board.----Two hundred twenty-six 226 = 2·113,centered pentagonal number .----Two hundred twenty-seven has its own article.Two hundred twenty-seven 227 prime,

safe prime ,twin prime with 229,Chen prime ,Eisenstein prime with no imaginary part, also the name of a TV show starringMarla Gibbs andHal Williams ----Two hundred twenty-eight 228 = 2^{2}·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,repdigit in base 7 (444).See also:

228 Incident ----Two hundred twenty-nine has its own article.Two hundred twenty-nine 229 prime,

twin prime with 227

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