12920656 has 20 divisors (see below), whose sum is σ = 28610272. Its totient is φ = 5537376.

The previous prime is 12920653. The next prime is 12920657. The reversal of 12920656 is 65602921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12920653) 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, 57570 + ... + 57793.

Almost surely, 2^12920656 is an apocalyptic number.

12920656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12920656 is an abundant number, since it is smaller than the sum of its proper divisors (15689616).

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

12920656 is a wasteful number, since it uses less digits than its factorization.

12920656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115378 (or 115372 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 12920656 is about 3594.5314020050. The cubic root of 12920656 is about 234.6541222346.

The spelling of 12920656 in words is "twelve million, nine hundred twenty thousand, six hundred fifty-six".