20979379360 has 24 divisors (see below), whose sum is σ = 49563784116. Its totient is φ = 8391751680.

The previous prime is 20979379357. The next prime is 20979379403. The reversal of 20979379360 is 6397397902.

It can be written as a sum of positive squares in 2 ways, for example, as 19417865104 + 1561514256 = 139348^2 + 39516^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65560401 + ... + 65560720.

Almost surely, 2^20979379360 is an apocalyptic number.

20979379360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20979379360 is an abundant number, since it is smaller than the sum of its proper divisors (28584404756).

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

20979379360 is a wasteful number, since it uses less digits than its factorization.

20979379360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131121136 (or 131121128 counting only the distinct ones).

The product of its (nonzero) digits is 3857868, while the sum is 55.

The spelling of 20979379360 in words is "twenty billion, nine hundred seventy-nine million, three hundred seventy-nine thousand, three hundred sixty".