31313340020 has 24 divisors (see below), whose sum is σ = 65771934984. Its totient is φ = 12522684416.

The previous prime is 31313340017. The next prime is 31313340049. The reversal of 31313340020 is 2004331313.

It can be written as a sum of positive squares in 4 ways, for example, as 6018346084 + 25294993936 = 77578^2 + 159044^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31313339974 and 31313340001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67469 + ... + 259188.

It is an arithmetic number, because the mean of its divisors is an integer number (2740497291).

Almost surely, 2^31313340020 is an apocalyptic number.

It is an amenable number.

31313340020 is an abundant number, since it is smaller than the sum of its proper divisors (34458594964).

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

31313340020 is a wasteful number, since it uses less digits than its factorization.

31313340020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331459 (or 331457 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31313340020 its reverse (2004331313), we get a palindrome (33317671333).

The spelling of 31313340020 in words is "thirty-one billion, three hundred thirteen million, three hundred forty thousand, twenty".