23136520 has 32 divisors (see below), whose sum is σ = 56790720. Its totient is φ = 8413120.

The previous prime is 23136481. The next prime is 23136523. The reversal of 23136520 is 2563132.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 23136491 and 23136500.

It is not an unprimeable number, because it can be changed into a prime (23136523) 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, 25852 + ... + 26731.

It is an arithmetic number, because the mean of its divisors is an integer number (1774710).

Almost surely, 2^23136520 is an apocalyptic number.

23136520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23136520 is an abundant number, since it is smaller than the sum of its proper divisors (33654200).

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

23136520 is a wasteful number, since it uses less digits than its factorization.

23136520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52605 (or 52601 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 23136520 is about 4810.0436588455. The cubic root of 23136520 is about 284.9482618711.

Adding to 23136520 its reverse (2563132), we get a palindrome (25699652).

The spelling of 23136520 in words is "twenty-three million, one hundred thirty-six thousand, five hundred twenty".