311231313020 has 96 divisors (see below), whose sum is σ = 674294906880. Its totient is φ = 120634597440.

The previous prime is 311231313017. The next prime is 311231313067. The reversal of 311231313020 is 20313132113.

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 = 311231312983 and 311231313001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2450640197 + ... + 2450640323.

It is an arithmetic number, because the mean of its divisors is an integer number (7023905280).

Almost surely, 2^311231313020 is an apocalyptic number.

It is an amenable number.

311231313020 is an abundant number, since it is smaller than the sum of its proper divisors (363063593860).

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

311231313020 is an equidigital number, since it uses as much as digits as its factorization.

311231313020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 311231313020 its reverse (20313132113), we get a palindrome (331544445133).

The spelling of 311231313020 in words is "three hundred eleven billion, two hundred thirty-one million, three hundred thirteen thousand, twenty".