31310220020 has 12 divisors (see below), whose sum is σ = 65751462084. Its totient is φ = 12524088000.

The previous prime is 31310220001. The next prime is 31310220043. The reversal of 31310220020 is 2002201313.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5357654416 + 25952565604 = 73196^2 + 161098^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31310219977 and 31310220004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782755481 + ... + 782755520.

It is an arithmetic number, because the mean of its divisors is an integer number (5479288507).

Almost surely, 2^31310220020 is an apocalyptic number.

It is an amenable number.

31310220020 is an abundant number, since it is smaller than the sum of its proper divisors (34441242064).

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

31310220020 is a wasteful number, since it uses less digits than its factorization.

31310220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565511010 (or 1565511008 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 31310220020 its reverse (2002201313), we get a palindrome (33312421333).

The spelling of 31310220020 in words is "thirty-one billion, three hundred ten million, two hundred twenty thousand, twenty".