20936560 has 20 divisors (see below), whose sum is σ = 48677688. Its totient is φ = 8374592.

The previous prime is 20936549. The next prime is 20936567. The reversal of 20936560 is 6563902.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20936567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130774 + ... + 130933.

Almost surely, 2^20936560 is an apocalyptic number.

20936560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20936560 is an abundant number, since it is smaller than the sum of its proper divisors (27741128).

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

20936560 is a wasteful number, since it uses less digits than its factorization.

20936560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261720 (or 261714 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 20936560 is about 4575.6485879053. The cubic root of 20936560 is about 275.6143181227.

The spelling of 20936560 in words is "twenty million, nine hundred thirty-six thousand, five hundred sixty".