220_(number)

220 (two hundred [and] twenty) is the natural number following 219 and preceding 221.

← 200 210 220 230 240 250 260 270 280 290 → List of numbers — Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	two hundred twenty
Ordinal	two hundred twentieth
Factorization	$220\; =\; 2^2\; \backslash cdot\; 5\; \backslash cdot\; 11$
Roman numeral	CCXX
Binary	11011100
Hexadecimal	DC

Contents 1 In mathematics 2 In other fields 3 References 3.1 221-229

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 an amicable number with 284. 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 220 AD or 220 BC.
• A common voltage in Europe.
• 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 120 film).
• An album by guitarist Phil 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.

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Two hundred twenty-two has its own article.

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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 of United Nations resolution 223, regarding the treatment of Israel, and the flight number of a British Airways plane believed targeted for the symbolism of its number

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Two hundred twenty-four 224 = 2⁵·7, Harshad number, Zuckerman number

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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 Scrabble board.

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Two hundred twenty-six 226 = 2·113, centered pentagonal number.

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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 starring Marla Gibbs and Hal Williams

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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, repdigit in base 7 (444).

See also: 228 Incident

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Two hundred twenty-nine has its own article.

Two hundred twenty-nine 229 prime, twin prime with 227

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