19979668928 has 28 divisors (see below), whose sum is σ = 39890410440. Its totient is φ = 9928541952.

The previous prime is 19979668913. The next prime is 19979668997. The reversal of 19979668928 is 82986697991.

It is a congruent number.

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, 947183 + ... + 968046.

Almost surely, 2^19979668928 is an apocalyptic number.

It is an amenable number.

19979668928 is a deficient number, since it is larger than the sum of its proper divisors (19910741512).

19979668928 is a wasteful number, since it uses less digits than its factorization.

19979668928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1915404 (or 1915394 counting only the distinct ones).

The product of its digits is 211631616, while the sum is 74.

The spelling of 19979668928 in words is "nineteen billion, nine hundred seventy-nine million, six hundred sixty-eight thousand, nine hundred twenty-eight".