20557672 has 16 divisors (see below), whose sum is σ = 38829060. Its totient is φ = 10203264.

The previous prime is 20557651. The next prime is 20557673. The reversal of 20557672 is 27675502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20376196 + 181476 = 4514^2 + 426^2 .

It is not an unprimeable number, because it can be changed into a prime (20557673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8283 + ... + 10474.

Almost surely, 2^20557672 is an apocalyptic number.

It is an amenable number.

20557672 is a deficient number, since it is larger than the sum of its proper divisors (18271388).

20557672 is a wasteful number, since it uses less digits than its factorization.

20557672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18900 (or 18896 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 34.

The square root of 20557672 is about 4534.0569030395. The cubic root of 20557672 is about 273.9415933902.

The spelling of 20557672 in words is "twenty million, five hundred fifty-seven thousand, six hundred seventy-two".