20712560 has 40 divisors (see below), whose sum is σ = 52536816. Its totient is φ = 7531520.

The previous prime is 20712553. The next prime is 20712577. The reversal of 20712560 is 6521702.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10889 + ... + 12648.

Almost surely, 2^20712560 is an apocalyptic number.

20712560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20712560 is an abundant number, since it is smaller than the sum of its proper divisors (31824256).

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

20712560 is a wasteful number, since it uses less digits than its factorization.

20712560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23561 (or 23555 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 20712560 is about 4551.1053602394. The cubic root of 20712560 is about 274.6278602709.

The spelling of 20712560 in words is "twenty million, seven hundred twelve thousand, five hundred sixty".