31304400020 has 24 divisors (see below), whose sum is σ = 65742897024. Its totient is φ = 12521063456.

The previous prime is 31304400013. The next prime is 31304400047. The reversal of 31304400020 is 2000440313.

It is a super-2 number, since 2×31304400020² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 476489 + ... + 538191.

It is an arithmetic number, because the mean of its divisors is an integer number (2739287376).

Almost surely, 2^31304400020 is an apocalyptic number.

It is an amenable number.

31304400020 is an abundant number, since it is smaller than the sum of its proper divisors (34438497004).

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

31304400020 is a wasteful number, since it uses less digits than its factorization.

31304400020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87079 (or 87077 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 31304400020 its reverse (2000440313), we get a palindrome (33304840333).

The spelling of 31304400020 in words is "thirty-one billion, three hundred four million, four hundred thousand, twenty".