656020 has 12 divisors (see below), whose sum is σ = 1377684. Its totient is φ = 262400.

The previous prime is 655987. The next prime is 656023. The reversal of 656020 is 20656.

It can be written as a sum of positive squares in 2 ways, for example, as 163216 + 492804 = 404^2 + 702^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656023) by changing a digit.

656020 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, 16381 + ... + 16420.

It is an arithmetic number, because the mean of its divisors is an integer number (114807).

2⁶⁵⁶⁰²⁰ is an apocalyptic number.

It is an amenable number.

656020 is an abundant number, since it is smaller than the sum of its proper divisors (721664).

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

656020 is a wasteful number, since it uses less digits than its factorization.

656020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32810 (or 32808 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 656020 is about 809.9506157785. The cubic root of 656020 is about 86.8905127311.

Adding to 656020 its reverse (20656), we get a palindrome (676676).

The spelling of 656020 in words is "six hundred fifty-six thousand, twenty".