31712020 has 24 divisors (see below), whose sum is σ = 67854024. Its totient is φ = 12445056.

The previous prime is 31712011. The next prime is 31712033. The reversal of 31712020 is 2021713.

31712020 = 1447² + 1448² + ... + 1461².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12475024 + 19236996 = 3532^2 + 4386^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31711985 and 31712003.

It is a congruent number.

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, 13899 + ... + 16018.

It is an arithmetic number, because the mean of its divisors is an integer number (2827251).

Almost surely, 2^31712020 is an apocalyptic number.

It is an amenable number.

31712020 is an abundant number, since it is smaller than the sum of its proper divisors (36142004).

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

31712020 is a wasteful number, since it uses less digits than its factorization.

31712020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29979 (or 29977 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 31712020 is about 5631.3426462967. The cubic root of 31712020 is about 316.5249646092.

Adding to 31712020 its reverse (2021713), we get a palindrome (33733733).

The spelling of 31712020 in words is "thirty-one million, seven hundred twelve thousand, twenty".