20776564 has 12 divisors (see below), whose sum is σ = 36429988. Its totient is φ = 10368000.

The previous prime is 20776559. The next prime is 20776571. The reversal of 20776564 is 46567702.

It can be written as a sum of positive squares in 2 ways, for example, as 12320100 + 8456464 = 3510^2 + 2908^2 .

It is a super-2 number, since 2×20776564² = 863331223292192, 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 3 ways as a sum of consecutive naturals, for example, 2637 + ... + 6964.

Almost surely, 2^20776564 is an apocalyptic number.

It is an amenable number.

20776564 is a deficient number, since it is larger than the sum of its proper divisors (15653424).

20776564 is a wasteful number, since it uses less digits than its factorization.

20776564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10146 (or 10144 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 20776564 is about 4558.1316347820. The cubic root of 20776564 is about 274.9104457708.

The spelling of 20776564 in words is "twenty million, seven hundred seventy-six thousand, five hundred sixty-four".