220556 has 12 divisors (see below), whose sum is σ = 441168. Its totient is φ = 94512.

The previous prime is 220553. The next prime is 220559. The reversal of 220556 is 655022.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (220553) and next prime (220559).

220556 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3911 + ... + 3966.

It is an arithmetic number, because the mean of its divisors is an integer number (36764).

2²²⁰⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

220556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220556 is a wasteful number, since it uses less digits than its factorization.

220556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7888 (or 7886 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 220556 is about 469.6338999689. The cubic root of 220556 is about 60.4189201432.

Adding to 220556 its reverse (655022), we get a palindrome (875578).

The spelling of 220556 in words is "two hundred twenty thousand, five hundred fifty-six".