23521920 has 64 divisors (see below), whose sum is σ = 74982240. Its totient is φ = 6272000.

The previous prime is 23521919. The next prime is 23521933. The reversal of 23521920 is 2912532.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

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 7 ways as a sum of consecutive naturals, for example, 4206 + ... + 8045.

Almost surely, 2^23521920 is an apocalyptic number.

23521920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23521920 is an abundant number, since it is smaller than the sum of its proper divisors (51460320).

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

23521920 is a wasteful number, since it uses less digits than its factorization.

23521920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12273 (or 12261 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 23521920 is about 4849.9402058170. The cubic root of 23521920 is about 286.5217463521.

It can be divided in two parts, 235 and 21920, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 23521920 in words is "twenty-three million, five hundred twenty-one thousand, nine hundred twenty".