320556 has 12 divisors (see below), whose sum is σ = 747992. Its totient is φ = 106848.

The previous prime is 320539. The next prime is 320561. The reversal of 320556 is 655023.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×320556² = 205512298272, which contains 22 as substring.

It is an unprimeable number.

320556 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13345 + ... + 13368.

2³²⁰⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

320556 is an abundant number, since it is smaller than the sum of its proper divisors (427436).

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

320556 is a wasteful number, since it uses less digits than its factorization.

320556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26720 (or 26718 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 320556 is about 566.1766508785. The cubic root of 320556 is about 68.4386293886.

Adding to 320556 its reverse (655023), we get a palindrome (975579).

The spelling of 320556 in words is "three hundred twenty thousand, five hundred fifty-six".