31312430020 has 12 divisors (see below), whose sum is σ = 65756103084. Its totient is φ = 12524972000.

The previous prime is 31312430003. The next prime is 31312430053. The reversal of 31312430020 is 2003421313.

It can be written as a sum of positive squares in 2 ways, for example, as 22836649924 + 8475780096 = 151118^2 + 92064^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31312430020.

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, 782810731 + ... + 782810770.

It is an arithmetic number, because the mean of its divisors is an integer number (5479675257).

Almost surely, 2^31312430020 is an apocalyptic number.

It is an amenable number.

31312430020 is an abundant number, since it is smaller than the sum of its proper divisors (34443673064).

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

31312430020 is a wasteful number, since it uses less digits than its factorization.

31312430020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565621510 (or 1565621508 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 31312430020 its reverse (2003421313), we get a palindrome (33315851333).

The spelling of 31312430020 in words is "thirty-one billion, three hundred twelve million, four hundred thirty thousand, twenty".