19885045764 has 24 divisors (see below), whose sum is σ = 48840463840. Its totient is φ = 6279488064.

The previous prime is 19885045729. The next prime is 19885045771. The reversal of 19885045764 is 46754058891.

It is a Harshad number since it is a multiple of its sum of digits (57).

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, 43607329 + ... + 43607784.

Almost surely, 2^19885045764 is an apocalyptic number.

It is an amenable number.

19885045764 is an abundant number, since it is smaller than the sum of its proper divisors (28955418076).

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

19885045764 is a wasteful number, since it uses less digits than its factorization.

19885045764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87215139 (or 87215137 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 57.

The spelling of 19885045764 in words is "nineteen billion, eight hundred eighty-five million, forty-five thousand, seven hundred sixty-four".