20577897 has 12 divisors (see below), whose sum is σ = 30131764. Its totient is φ = 13530240.

The previous prime is 20577881. The next prime is 20577899. The reversal of 20577897 is 79877502.

It can be written as a sum of positive squares in 2 ways, for example, as 11451456 + 9126441 = 3384^2 + 3021^2 .

It is not a de Polignac number, because 20577897 - 2⁴ = 20577881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20577899) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15004 + ... + 16317.

Almost surely, 2^20577897 is an apocalyptic number.

It is an amenable number.

20577897 is a deficient number, since it is larger than the sum of its proper divisors (9553867).

20577897 is a wasteful number, since it uses less digits than its factorization.

20577897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31400 (or 31397 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 45.

The square root of 20577897 is about 4536.2866972889. The cubic root of 20577897 is about 274.0314001345.

The spelling of 20577897 in words is "twenty million, five hundred seventy-seven thousand, eight hundred ninety-seven".