23509605 has 64 divisors (see below), whose sum is σ = 45416448. Its totient is φ = 10160640.

The previous prime is 23509601. The next prime is 23509609. The reversal of 23509605 is 50690532.

23509605 is nontrivially palindromic in base 4.

It is an interprime number because it is at equal distance from previous prime (23509601) and next prime (23509609).

It is not a de Polignac number, because 23509605 - 2² = 23509601 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23509601) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 185052 + ... + 185178.

It is an arithmetic number, because the mean of its divisors is an integer number (709632).

Almost surely, 2^23509605 is an apocalyptic number.

It is an amenable number.

23509605 is a deficient number, since it is larger than the sum of its proper divisors (21906843).

23509605 is a wasteful number, since it uses less digits than its factorization.

23509605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226.

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 23509605 is about 4848.6704363155. The cubic root of 23509605 is about 286.4717344019.

The spelling of 23509605 in words is "twenty-three million, five hundred nine thousand, six hundred five".