23009520 has 40 divisors (see below), whose sum is σ = 71330256. Its totient is φ = 6135808.

The previous prime is 23009489. The next prime is 23009521. The reversal of 23009520 is 2590032.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23009521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47697 + ... + 48176.

Almost surely, 2^23009520 is an apocalyptic number.

23009520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23009520 is an abundant number, since it is smaller than the sum of its proper divisors (48320736).

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

23009520 is a wasteful number, since it uses less digits than its factorization.

23009520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95889 (or 95883 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 23009520 is about 4796.8239492397. The cubic root of 23009520 is about 284.4259296940.

Adding to 23009520 its reverse (2590032), we get a palindrome (25599552).

The spelling of 23009520 in words is "twenty-three million, nine thousand, five hundred twenty".