20879131 has 12 divisors (see below), whose sum is σ = 25751152. Its totient is φ = 16485264.

The previous prime is 20879129. The next prime is 20879161. The reversal of 20879131 is 13197802.

It is not a de Polignac number, because 20879131 - 2¹ = 20879129 is a prime.

It is a super-2 number, since 2×20879131² = 871876222630322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 20879093 and 20879102.

It is not an unprimeable number, because it can be changed into a prime (20879161) 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, 43350 + ... + 43828.

Almost surely, 2^20879131 is an apocalyptic number.

20879131 is a deficient number, since it is larger than the sum of its proper divisors (4872021).

20879131 is an frugal number, since it uses more digits than its factorization.

20879131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978 (or 499 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 20879131 is about 4569.3687747872. The cubic root of 20879131 is about 275.3620839277.

The spelling of 20879131 in words is "twenty million, eight hundred seventy-nine thousand, one hundred thirty-one".