31020680 has 16 divisors (see below), whose sum is σ = 69796620. Its totient is φ = 12408256.

The previous prime is 31020679. The next prime is 31020701. The reversal of 31020680 is 8602013.

It can be written as a sum of positive squares in 2 ways, for example, as 30713764 + 306916 = 5542^2 + 554^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387719 + ... + 387798.

Almost surely, 2^31020680 is an apocalyptic number.

It is an amenable number.

31020680 is an abundant number, since it is smaller than the sum of its proper divisors (38775940).

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

31020680 is a wasteful number, since it uses less digits than its factorization.

31020680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775528 (or 775524 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 31020680 is about 5569.6211720367. The cubic root of 31020680 is about 314.2079032085.

Adding to 31020680 its reverse (8602013), we get a palindrome (39622693).

The spelling of 31020680 in words is "thirty-one million, twenty thousand, six hundred eighty".