311431220120 has 32 divisors (see below), whose sum is σ = 700794929520. Its totient is φ = 124559210880.

The previous prime is 311431220119. The next prime is 311431220141. The reversal of 311431220120 is 21022134113.

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 = 311431220092 and 311431220101.

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, 30527 + ... + 789806.

Almost surely, 2^311431220120 is an apocalyptic number.

It is an amenable number.

311431220120 is an abundant number, since it is smaller than the sum of its proper divisors (389363709400).

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

311431220120 is a wasteful number, since it uses less digits than its factorization.

311431220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829835 (or 829831 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 311431220120 its reverse (21022134113), we get a palindrome (332453354233).

The spelling of 311431220120 in words is "three hundred eleven billion, four hundred thirty-one million, two hundred twenty thousand, one hundred twenty".