31324420 has 24 divisors (see below), whose sum is σ = 66389400. Its totient is φ = 12413952.

The previous prime is 31324417. The next prime is 31324439. The reversal of 31324420 is 2442313.

It can be written as a sum of positive squares in 4 ways, for example, as 6563844 + 24760576 = 2562^2 + 4976^2 .

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, 5005 + ... + 9364.

It is an arithmetic number, because the mean of its divisors is an integer number (2766225).

Almost surely, 2^31324420 is an apocalyptic number.

It is an amenable number.

31324420 is an abundant number, since it is smaller than the sum of its proper divisors (35064980).

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

31324420 is a wasteful number, since it uses less digits than its factorization.

31324420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14487 (or 14485 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 31324420 is about 5596.8223127057. The cubic root of 31324420 is about 315.2300997864.

Adding to 31324420 its reverse (2442313), we get a palindrome (33766733).

The spelling of 31324420 in words is "thirty-one million, three hundred twenty-four thousand, four hundred twenty".