31345120420 has 48 divisors (see below), whose sum is σ = 69304536000. Its totient is φ = 11875524480.

The previous prime is 31345120381. The next prime is 31345120481. The reversal of 31345120420 is 2402154313.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3145606 + ... + 3155554.

It is an arithmetic number, because the mean of its divisors is an integer number (1443844500).

Almost surely, 2^31345120420 is an apocalyptic number.

It is an amenable number.

31345120420 is an abundant number, since it is smaller than the sum of its proper divisors (37959415580).

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

31345120420 is a wasteful number, since it uses less digits than its factorization.

31345120420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18268 (or 18266 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 31345120420 its reverse (2402154313), we get a palindrome (33747274733).

The spelling of 31345120420 in words is "thirty-one billion, three hundred forty-five million, one hundred twenty thousand, four hundred twenty".