31477920 has 48 divisors (see below), whose sum is σ = 99156960. Its totient is φ = 8393984.

The previous prime is 31477907. The next prime is 31477937. The reversal of 31477920 is 2977413.

It is a tau number, because it is divible by the number of its divisors (48).

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, 32310 + ... + 33269.

It is an arithmetic number, because the mean of its divisors is an integer number (2065770).

Almost surely, 2^31477920 is an apocalyptic number.

31477920 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31477920 is an abundant number, since it is smaller than the sum of its proper divisors (67679040).

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

31477920 is a wasteful number, since it uses less digits than its factorization.

31477920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65597 (or 65589 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 31477920 is about 5610.5186925988. The cubic root of 31477920 is about 315.7441715131.

The spelling of 31477920 in words is "thirty-one million, four hundred seventy-seven thousand, nine hundred twenty".