20800972 has 12 divisors (see below), whose sum is σ = 38317720. Its totient is φ = 9853056.

The previous prime is 20800891. The next prime is 20800973. The reversal of 20800972 is 27900802.

It is a super-2 number, since 2×20800972² = 865360872289568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20800972.

It is not an unprimeable number, because it can be changed into a prime (20800973) 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, 136773 + ... + 136924.

Almost surely, 2^20800972 is an apocalyptic number.

It is an amenable number.

20800972 is a deficient number, since it is larger than the sum of its proper divisors (17516748).

20800972 is a wasteful number, since it uses less digits than its factorization.

20800972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273720 (or 273718 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 20800972 is about 4560.8082617010. The cubic root of 20800972 is about 275.0180572165.

The spelling of 20800972 in words is "twenty million, eight hundred thousand, nine hundred seventy-two".