19913497072 has 20 divisors (see below), whose sum is σ = 44094172336. Its totient is φ = 8534355840.

The previous prime is 19913497061. The next prime is 19913497081. The reversal of 19913497072 is 27079431991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88899429 + ... + 88899652.

Almost surely, 2^19913497072 is an apocalyptic number.

It is an amenable number.

19913497072 is an abundant number, since it is smaller than the sum of its proper divisors (24180675264).

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

19913497072 is a wasteful number, since it uses less digits than its factorization.

19913497072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177799096 (or 177799090 counting only the distinct ones).

The product of its (nonzero) digits is 857304, while the sum is 52.

The spelling of 19913497072 in words is "nineteen billion, nine hundred thirteen million, four hundred ninety-seven thousand, seventy-two".