20979013 has 16 divisors (see below), whose sum is σ = 24147072. Its totient is φ = 18040000.

The previous prime is 20979001. The next prime is 20979017. The reversal of 20979013 is 31097902.

It is not a de Polignac number, because 20979013 - 2⁵ = 20978981 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 (20979017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25143 + ... + 25963.

It is an arithmetic number, because the mean of its divisors is an integer number (1509192).

Almost surely, 2^20979013 is an apocalyptic number.

20979013 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20979013 is a deficient number, since it is larger than the sum of its proper divisors (3168059).

20979013 is a wasteful number, since it uses less digits than its factorization.

20979013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 20979013 is about 4580.2852531256. The cubic root of 20979013 is about 275.8004797953.

The spelling of 20979013 in words is "twenty million, nine hundred seventy-nine thousand, thirteen".