20564372 has 6 divisors (see below), whose sum is σ = 35987658. Its totient is φ = 10282184.

The previous prime is 20564359. The next prime is 20564387. The reversal of 20564372 is 27346502.

It can be written as a sum of positive squares in only one way, i.e., 17007376 + 3556996 = 4124^2 + 1886^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2570543 + ... + 2570550.

It is an arithmetic number, because the mean of its divisors is an integer number (5997943).

Almost surely, 2^20564372 is an apocalyptic number.

It is an amenable number.

20564372 is a deficient number, since it is larger than the sum of its proper divisors (15423286).

20564372 is a wasteful number, since it uses less digits than its factorization.

20564372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5141097 (or 5141095 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 20564372 is about 4534.7956955082. The cubic root of 20564372 is about 273.9713504774.

The spelling of 20564372 in words is "twenty million, five hundred sixty-four thousand, three hundred seventy-two".