19291090920 has 32 divisors (see below), whose sum is σ = 57873273120. Its totient is φ = 5144290880.

The previous prime is 19291090879. The next prime is 19291090939. The reversal of 19291090920 is 2909019291.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80379426 + ... + 80379665.

It is an arithmetic number, because the mean of its divisors is an integer number (1808539785).

Almost surely, 2^19291090920 is an apocalyptic number.

19291090920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19291090920 is an abundant number, since it is smaller than the sum of its proper divisors (38582182200).

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

19291090920 is a wasteful number, since it uses less digits than its factorization.

19291090920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160759105 (or 160759101 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 42.

The spelling of 19291090920 in words is "nineteen billion, two hundred ninety-one million, ninety thousand, nine hundred twenty".