20662564 has 12 divisors (see below), whose sum is σ = 38941084. Its totient is φ = 9536544.

The previous prime is 20662561. The next prime is 20662589. The reversal of 20662564 is 46526602.

It can be written as a sum of positive squares in 2 ways, for example, as 7398400 + 13264164 = 2720^2 + 3642^2 .

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (20662561) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 198627 + ... + 198730.

Almost surely, 2^20662564 is an apocalyptic number.

It is an amenable number.

20662564 is a deficient number, since it is larger than the sum of its proper divisors (18278520).

20662564 is a wasteful number, since it uses less digits than its factorization.

20662564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397374 (or 397372 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 20662564 is about 4545.6093100925. The cubic root of 20662564 is about 274.4067165664.

The spelling of 20662564 in words is "twenty million, six hundred sixty-two thousand, five hundred sixty-four".