19904106768 has 160 divisors (see below), whose sum is σ = 63495269376. Its totient is φ = 5231983104.

The previous prime is 19904106757. The next prime is 19904106793. The reversal of 19904106768 is 86760140991.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 19904106768.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1333555 + ... + 1348397.

Almost surely, 2^19904106768 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19904106768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31747634688).

19904106768 is an abundant number, since it is smaller than the sum of its proper divisors (43591162608).

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

19904106768 is a wasteful number, since it uses less digits than its factorization.

19904106768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15181 (or 15175 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 51.

The spelling of 19904106768 in words is "nineteen billion, nine hundred four million, one hundred six thousand, seven hundred sixty-eight".