20116564 has 24 divisors (see below), whose sum is σ = 38723328. Its totient is φ = 9085920.

The previous prime is 20116543. The next prime is 20116619. The reversal of 20116564 is 46561102.

It is a super-2 number, since 2×20116564² = 809352294332192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1672 + ... + 6559.

It is an arithmetic number, because the mean of its divisors is an integer number (1613472).

Almost surely, 2^20116564 is an apocalyptic number.

It is an amenable number.

20116564 is a deficient number, since it is larger than the sum of its proper divisors (18606764).

20116564 is a wasteful number, since it uses less digits than its factorization.

20116564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8295 (or 8293 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 20116564 is about 4485.1492728782. The cubic root of 20116564 is about 271.9680794433.

Adding to 20116564 its reverse (46561102), we get a palindrome (66677666).

The spelling of 20116564 in words is "twenty million, one hundred sixteen thousand, five hundred sixty-four".