23156920 has 16 divisors (see below), whose sum is σ = 52103160. Its totient is φ = 9262752.

The previous prime is 23156911. The next prime is 23156933. The reversal of 23156920 is 2965132.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289422 + ... + 289501.

Almost surely, 2^23156920 is an apocalyptic number.

23156920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23156920 is an abundant number, since it is smaller than the sum of its proper divisors (28946240).

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

23156920 is a wasteful number, since it uses less digits than its factorization.

23156920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578934 (or 578930 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 23156920 is about 4812.1637544872. The cubic root of 23156920 is about 285.0319857401.

The spelling of 23156920 in words is "twenty-three million, one hundred fifty-six thousand, nine hundred twenty".