20168564 has 12 divisors (see below), whose sum is σ = 38010084. Its totient is φ = 9308544.

The previous prime is 20168527. The next prime is 20168573. The reversal of 20168564 is 46586102.

It can be written as a sum of positive squares in 2 ways, for example, as 2696164 + 17472400 = 1642^2 + 4180^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20168564.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193877 + ... + 193980.

It is an arithmetic number, because the mean of its divisors is an integer number (3167507).

Almost surely, 2^20168564 is an apocalyptic number.

It is an amenable number.

20168564 is a deficient number, since it is larger than the sum of its proper divisors (17841520).

20168564 is a wasteful number, since it uses less digits than its factorization.

20168564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387874 (or 387872 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20168564 is about 4490.9424400676. The cubic root of 20168564 is about 272.2022177041.

The spelling of 20168564 in words is "twenty million, one hundred sixty-eight thousand, five hundred sixty-four".