23405564 has 24 divisors (see below), whose sum is σ = 50412768. Its totient is φ = 9259200.

The previous prime is 23405563. The next prime is 23405593. The reversal of 23405564 is 46550432.

23405564 = 146² + 147² + ... + 418².

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23405561) 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, 31787 + ... + 32514.

It is an arithmetic number, because the mean of its divisors is an integer number (2100532).

Almost surely, 2^23405564 is an apocalyptic number.

It is an amenable number.

23405564 is an abundant number, since it is smaller than the sum of its proper divisors (27007204).

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

23405564 is a wasteful number, since it uses less digits than its factorization.

23405564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64325 (or 64323 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 23405564 is about 4837.9297225156. The cubic root of 23405564 is about 286.0485189988.

Adding to 23405564 its reverse (46550432), we get a palindrome (69955996).

The spelling of 23405564 in words is "twenty-three million, four hundred five thousand, five hundred sixty-four".