31313430020 has 24 divisors (see below), whose sum is σ = 65888956224. Its totient is φ = 12500466656.

The previous prime is 31313429999. The next prime is 31313430089. The reversal of 31313430020 is 2003431313.

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 = 31313429974 and 31313430001.

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, 1546274 + ... + 1566393.

It is an arithmetic number, because the mean of its divisors is an integer number (2745373176).

Almost surely, 2^31313430020 is an apocalyptic number.

It is an amenable number.

31313430020 is an abundant number, since it is smaller than the sum of its proper divisors (34575526204).

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

31313430020 is a wasteful number, since it uses less digits than its factorization.

31313430020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113179 (or 3113177 counting only the distinct ones).

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

Adding to 31313430020 its reverse (2003431313), we get a palindrome (33316861333).

The spelling of 31313430020 in words is "thirty-one billion, three hundred thirteen million, four hundred thirty thousand, twenty".