19904870979 has 48 divisors (see below), whose sum is σ = 34357440000. Its totient is φ = 10857483648.

The previous prime is 19904870929. The next prime is 19904870989. The reversal of 19904870979 is 97907840991.

It is not a de Polignac number, because 19904870979 - 2⁹ = 19904870467 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (19904870929) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 709287 + ... + 736815.

It is an arithmetic number, because the mean of its divisors is an integer number (715780000).

Almost surely, 2^19904870979 is an apocalyptic number.

19904870979 is a deficient number, since it is larger than the sum of its proper divisors (14452569021).

19904870979 is a wasteful number, since it uses less digits than its factorization.

19904870979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28064 (or 28061 counting only the distinct ones).

The product of its (nonzero) digits is 10287648, while the sum is 63.

The spelling of 19904870979 in words is "nineteen billion, nine hundred four million, eight hundred seventy thousand, nine hundred seventy-nine".