20968564 has 6 divisors (see below), whose sum is σ = 36694994. Its totient is φ = 10484280.

The previous prime is 20968559. The next prime is 20968573. The reversal of 20968564 is 46586902.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17388900 + 3579664 = 4170^2 + 1892^2 .

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, 2621067 + ... + 2621074.

Almost surely, 2^20968564 is an apocalyptic number.

It is an amenable number.

20968564 is a deficient number, since it is larger than the sum of its proper divisors (15726430).

20968564 is a wasteful number, since it uses less digits than its factorization.

20968564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5242145 (or 5242143 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 20968564 is about 4579.1444615779. The cubic root of 20968564 is about 275.7546829507.

The spelling of 20968564 in words is "twenty million, nine hundred sixty-eight thousand, five hundred sixty-four".