20712564 has 24 divisors (see below), whose sum is σ = 53699520. Its totient is φ = 6904152.

The previous prime is 20712553. The next prime is 20712577. The reversal of 20712564 is 46521702.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 95784 + ... + 95999.

It is an arithmetic number, because the mean of its divisors is an integer number (2237480).

Almost surely, 2^20712564 is an apocalyptic number.

It is an amenable number.

20712564 is an abundant number, since it is smaller than the sum of its proper divisors (32986956).

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

20712564 is a wasteful number, since it uses less digits than its factorization.

20712564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191796 (or 191788 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 20712564 is about 4551.1057996931. The cubic root of 20712564 is about 274.6278779495.

The spelling of 20712564 in words is "twenty million, seven hundred twelve thousand, five hundred sixty-four".