19921974604 has 24 divisors (see below), whose sum is σ = 39886076160. Its totient is φ = 8528961936.

The previous prime is 19921974599. The next prime is 19921974619. The reversal of 19921974604 is 40647912991.

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, 349144 + ... + 402175.

It is an arithmetic number, because the mean of its divisors is an integer number (1661919840).

Almost surely, 2^19921974604 is an apocalyptic number.

19921974604 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19921974604 is an abundant number, since it is smaller than the sum of its proper divisors (19964101556).

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

19921974604 is a wasteful number, since it uses less digits than its factorization.

19921974604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752277 (or 752275 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 19921974604 in words is "nineteen billion, nine hundred twenty-one million, nine hundred seventy-four thousand, six hundred four".