31712420 has 24 divisors (see below), whose sum is σ = 66853248. Its totient is φ = 12636000.

The previous prime is 31712419. The next prime is 31712431. The reversal of 31712420 is 2421713.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31712392 and 31712401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2495 + ... + 8345.

It is an arithmetic number, because the mean of its divisors is an integer number (2785552).

Almost surely, 2^31712420 is an apocalyptic number.

It is an amenable number.

31712420 is an abundant number, since it is smaller than the sum of its proper divisors (35140828).

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

31712420 is a wasteful number, since it uses less digits than its factorization.

31712420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6131 (or 6129 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 31712420 is about 5631.3781616936. The cubic root of 31712420 is about 316.5262954343.

The spelling of 31712420 in words is "thirty-one million, seven hundred twelve thousand, four hundred twenty".