19979539044 has 24 divisors (see below), whose sum is σ = 46683069888. Its totient is φ = 6650682720.

The previous prime is 19979539043. The next prime is 19979539061. The reversal of 19979539044 is 44093597991.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19979539043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1136367 + ... + 1153814.

It is an arithmetic number, because the mean of its divisors is an integer number (1945127912).

Almost surely, 2^19979539044 is an apocalyptic number.

It is an amenable number.

19979539044 is an abundant number, since it is smaller than the sum of its proper divisors (26703530844).

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

19979539044 is a wasteful number, since it uses less digits than its factorization.

19979539044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290915 (or 2290913 counting only the distinct ones).

The product of its (nonzero) digits is 11022480, while the sum is 60.

The spelling of 19979539044 in words is "nineteen billion, nine hundred seventy-nine million, five hundred thirty-nine thousand, forty-four".