20973879 has 6 divisors (see below), whose sum is σ = 30295616. Its totient is φ = 13982580.

The previous prime is 20973877. The next prime is 20973893. The reversal of 20973879 is 97837902.

It is not a de Polignac number, because 20973879 - 2¹ = 20973877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20973871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1165207 + ... + 1165224.

Almost surely, 2^20973879 is an apocalyptic number.

20973879 is a deficient number, since it is larger than the sum of its proper divisors (9321737).

20973879 is a wasteful number, since it uses less digits than its factorization.

20973879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2330437 (or 2330434 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 20973879 is about 4579.7247733898. The cubic root of 20973879 is about 275.7779799255. Note that the first 3 decimals are identical.

It can be divided in two parts, 209 and 73879, that added together give a cube (74088 = 42³).

The spelling of 20973879 in words is "twenty million, nine hundred seventy-three thousand, eight hundred seventy-nine".