31020424 has 16 divisors (see below), whose sum is σ = 58222620. Its totient is φ = 15494400.

The previous prime is 31020373. The next prime is 31020449. The reversal of 31020424 is 42402013.

It can be written as a sum of positive squares in 2 ways, for example, as 24820324 + 6200100 = 4982^2 + 2490^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31020398 and 31020407.

It is a congruent number.

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, 13332 + ... + 15484.

Almost surely, 2^31020424 is an apocalyptic number.

It is an amenable number.

31020424 is a deficient number, since it is larger than the sum of its proper divisors (27202196).

31020424 is a wasteful number, since it uses less digits than its factorization.

31020424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960 (or 3956 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 31020424 is about 5569.5981901749. The cubic root of 31020424 is about 314.2070388664.

Adding to 31020424 its reverse (42402013), we get a palindrome (73422437).

The spelling of 31020424 in words is "thirty-one million, twenty thousand, four hundred twenty-four".