23531520 has 104 divisors (see below), whose sum is σ = 75488256. Its totient is φ = 6258688.

The previous prime is 23531513. The next prime is 23531527. The reversal of 23531520 is 2513532.

It is an interprime number because it is at equal distance from previous prime (23531513) and next prime (23531527).

It is not an unprimeable number, because it can be changed into a prime (23531527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61249 + ... + 61631.

Almost surely, 2^23531520 is an apocalyptic number.

23531520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23531520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37744128).

23531520 is an abundant number, since it is smaller than the sum of its proper divisors (51956736).

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

23531520 is an equidigital number, since it uses as much as digits as its factorization.

23531520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 21.

The square root of 23531520 is about 4850.9298077791. The cubic root of 23531520 is about 286.5607204190.

The spelling of 23531520 in words is "twenty-three million, five hundred thirty-one thousand, five hundred twenty".