19531420872 has 32 divisors (see below), whose sum is σ = 49120948800. Its totient is φ = 6471487424.

The previous prime is 19531420817. The next prime is 19531420897. The reversal of 19531420872 is 27802413591.

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, 2432547 + ... + 2440562.

It is an arithmetic number, because the mean of its divisors is an integer number (1535029650).

Almost surely, 2^19531420872 is an apocalyptic number.

19531420872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19531420872 is an abundant number, since it is smaller than the sum of its proper divisors (29589527928).

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

19531420872 is a wasteful number, since it uses less digits than its factorization.

19531420872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4873285 (or 4873281 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 19531420872 in words is "nineteen billion, five hundred thirty-one million, four hundred twenty thousand, eight hundred seventy-two".