23563840 has 28 divisors (see below), whose sum is σ = 56112156. Its totient is φ = 9425408.

The previous prime is 23563831. The next prime is 23563843. The reversal of 23563840 is 4836532.

It can be written as a sum of positive squares in 2 ways, for example, as 17842176 + 5721664 = 4224^2 + 2392^2 .

It is not an unprimeable number, because it can be changed into a prime (23563843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36499 + ... + 37138.

Almost surely, 2^23563840 is an apocalyptic number.

23563840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23563840 is an abundant number, since it is smaller than the sum of its proper divisors (32548316).

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

23563840 is an equidigital number, since it uses as much as digits as its factorization.

23563840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73654 (or 73644 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 23563840 is about 4854.2599847969. The cubic root of 23563840 is about 286.6918552472.

The spelling of 23563840 in words is "twenty-three million, five hundred sixty-three thousand, eight hundred forty".