23399920 has 40 divisors (see below), whose sum is σ = 54621504. Its totient is φ = 9322752.

The previous prime is 23399911. The next prime is 23399921. The reversal of 23399920 is 2999332.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 23399920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23399921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28962 + ... + 29758.

Almost surely, 2^23399920 is an apocalyptic number.

23399920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23399920 is an abundant number, since it is smaller than the sum of its proper divisors (31221584).

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

23399920 is a wasteful number, since it uses less digits than its factorization.

23399920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177 (or 1171 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 23399920 is about 4837.3463799898. The cubic root of 23399920 is about 286.0255246426.

The spelling of 23399920 in words is "twenty-three million, three hundred ninety-nine thousand, nine hundred twenty".