15171331920 has 40 divisors (see below), whose sum is σ = 47031129696. Its totient is φ = 4045688448.

The previous prime is 15171331909. The next prime is 15171331937. The reversal of 15171331920 is 2913317151.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 31606702 + ... + 31607181.

Almost surely, 2^15171331920 is an apocalyptic number.

15171331920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15171331920 is an abundant number, since it is smaller than the sum of its proper divisors (31859797776).

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

15171331920 is a wasteful number, since it uses less digits than its factorization.

15171331920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63213899 (or 63213893 counting only the distinct ones).

The product of its (nonzero) digits is 5670, while the sum is 33.

The spelling of 15171331920 in words is "fifteen billion, one hundred seventy-one million, three hundred thirty-one thousand, nine hundred twenty".