20979156 has 48 divisors (see below), whose sum is σ = 56548800. Its totient is φ = 5982720.

The previous prime is 20979137. The next prime is 20979187. The reversal of 20979156 is 65197902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2431 + ... + 6918.

It is an arithmetic number, because the mean of its divisors is an integer number (1178100).

Almost surely, 2^20979156 is an apocalyptic number.

It is an amenable number.

20979156 is an abundant number, since it is smaller than the sum of its proper divisors (35569644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20979156 is a wasteful number, since it uses less digits than its factorization.

20979156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9384 (or 9382 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 20979156 is about 4580.3008634805. The cubic root of 20979156 is about 275.8011064434.

The spelling of 20979156 in words is "twenty million, nine hundred seventy-nine thousand, one hundred fifty-six".