31102471920 has 80 divisors (see below), whose sum is σ = 103834416672. Its totient is φ = 7655992320.

The previous prime is 31102471909. The next prime is 31102471927. The reversal of 31102471920 is 2917420113.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31102471927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4981251 + ... + 4987490.

Almost surely, 2^31102471920 is an apocalyptic number.

31102471920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31102471920 is an abundant number, since it is smaller than the sum of its proper divisors (72731944752).

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

31102471920 is a wasteful number, since it uses less digits than its factorization.

31102471920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9968770 (or 9968764 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The spelling of 31102471920 in words is "thirty-one billion, one hundred two million, four hundred seventy-one thousand, nine hundred twenty".