23539820 has 24 divisors (see below), whose sum is σ = 50274000. Its totient is φ = 9255872.

The previous prime is 23539811. The next prime is 23539829. The reversal of 23539820 is 2893532.

It is an interprime number because it is at equal distance from previous prime (23539811) and next prime (23539829).

It is not an unprimeable number, because it can be changed into a prime (23539829) 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, 8795 + ... + 11154.

It is an arithmetic number, because the mean of its divisors is an integer number (2094750).

Almost surely, 2^23539820 is an apocalyptic number.

23539820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23539820 is an abundant number, since it is smaller than the sum of its proper divisors (26734180).

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

23539820 is a wasteful number, since it uses less digits than its factorization.

23539820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20017 (or 20015 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 23539820 is about 4851.7852384457. The cubic root of 23539820 is about 286.5944082044.

The spelling of 23539820 in words is "twenty-three million, five hundred thirty-nine thousand, eight hundred twenty".