13656920 has 16 divisors (see below), whose sum is σ = 30728160. Its totient is φ = 5462752.

The previous prime is 13656911. The next prime is 13656989. The reversal of 13656920 is 2965631.

It is a happy number.

It is a super-2 number, since 2×13656920² = 373022927772800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170672 + ... + 170751.

It is an arithmetic number, because the mean of its divisors is an integer number (1920510).

Almost surely, 2^13656920 is an apocalyptic number.

13656920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13656920 is an abundant number, since it is smaller than the sum of its proper divisors (17071240).

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

13656920 is a wasteful number, since it uses less digits than its factorization.

13656920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341434 (or 341430 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 13656920 is about 3695.5270260140. The cubic root of 13656920 is about 239.0291800999.

The spelling of 13656920 in words is "thirteen million, six hundred fifty-six thousand, nine hundred twenty".