19928991018 has 32 divisors (see below), whose sum is σ = 41167867392. Its totient is φ = 6424934400.

The previous prime is 19928990993. The next prime is 19928991041. The reversal of 19928991018 is 81019982991.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295498 + ... + 356618.

It is an arithmetic number, because the mean of its divisors is an integer number (1286495856).

Almost surely, 2^19928991018 is an apocalyptic number.

19928991018 is an abundant number, since it is smaller than the sum of its proper divisors (21238876374).

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

19928991018 is a wasteful number, since it uses less digits than its factorization.

19928991018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62910.

The product of its (nonzero) digits is 839808, while the sum is 57.

The spelling of 19928991018 in words is "nineteen billion, nine hundred twenty-eight million, nine hundred ninety-one thousand, eighteen".