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

220
Ordinal	two hundred twenty
Cardinal	two hundred twentieth
Factorization
Roman numeral	CCXX
Binary	11011100
Hexadecimal	DC

Mathematics

It is a composite number, with its divisors being 2, 4, 5, 10, 11, 20, 22, 44, 55 and 110, making it an amicable number with two hundred eighty-four. 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.

Other fields

220 is:

• A common voltage in the United States and Canada.
• In the Holy 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).
• The designation of some spur routes of U.S. Interstate 20.
• The year A.D. 220.