23405605 has 12 divisors (see below), whose sum is σ = 29364300. Its totient is φ = 17908352.

The previous prime is 23405593. The next prime is 23405609. The reversal of 23405605 is 50650432.

It can be written as a sum of positive squares in 2 ways, for example, as 2666689 + 20738916 = 1633^2 + 4554^2 .

It is a de Polignac number, because none of the positive numbers 2^k-23405605 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23405605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23405609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1780 + ... + 7069.

It is an arithmetic number, because the mean of its divisors is an integer number (2447025).

Almost surely, 2^23405605 is an apocalyptic number.

It is an amenable number.

23405605 is a deficient number, since it is larger than the sum of its proper divisors (5958695).

23405605 is an equidigital number, since it uses as much as digits as its factorization.

23405605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8900 (or 8877 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 23405605 is about 4837.9339598634. The cubic root of 23405605 is about 286.0486860243.

The spelling of 23405605 in words is "twenty-three million, four hundred five thousand, six hundred five".