31310330020 has 12 divisors (see below), whose sum is σ = 65751693084. Its totient is φ = 12524132000.

The previous prime is 31310330017. The next prime is 31310330021. The reversal of 31310330020 is 2003301313.

It can be written as a sum of positive squares in 2 ways, for example, as 13480603236 + 17829726784 = 116106^2 + 133528^2 .

It is a super-2 number, since 2×31310330020² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31310329976 and 31310330003.

It is not an unprimeable number, because it can be changed into a prime (31310330021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782758231 + ... + 782758270.

It is an arithmetic number, because the mean of its divisors is an integer number (5479307757).

Almost surely, 2^31310330020 is an apocalyptic number.

It is an amenable number.

31310330020 is an abundant number, since it is smaller than the sum of its proper divisors (34441363064).

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

31310330020 is a wasteful number, since it uses less digits than its factorization.

31310330020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565516510 (or 1565516508 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 16.

Adding to 31310330020 its reverse (2003301313), we get a palindrome (33313631333).

The spelling of 31310330020 in words is "thirty-one billion, three hundred ten million, three hundred thirty thousand, twenty".