20979839870 has 16 divisors (see below), whose sum is σ = 41196776688. Its totient is φ = 7629032640.

The previous prime is 20979839801. The next prime is 20979839897. The reversal of 20979839870 is 7893897902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95362799 + ... + 95363018.

It is an arithmetic number, because the mean of its divisors is an integer number (2574798543).

Almost surely, 2^20979839870 is an apocalyptic number.

20979839870 is a deficient number, since it is larger than the sum of its proper divisors (20216936818).

20979839870 is a wasteful number, since it uses less digits than its factorization.

20979839870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190725835.

The product of its (nonzero) digits is 13716864, while the sum is 62.

The spelling of 20979839870 in words is "twenty billion, nine hundred seventy-nine million, eight hundred thirty-nine thousand, eight hundred seventy".