311223321020 has 48 divisors (see below), whose sum is σ = 688737446208. Its totient is φ = 117897753600.

The previous prime is 311223321007. The next prime is 311223321091. The reversal of 311223321020 is 20123322113.

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 = 311223320983 and 311223321001.

It is a congruent number.

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, 3302909 + ... + 3395828.

It is an arithmetic number, because the mean of its divisors is an integer number (14348696796).

Almost surely, 2^311223321020 is an apocalyptic number.

It is an amenable number.

311223321020 is an abundant number, since it is smaller than the sum of its proper divisors (377514125188).

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

311223321020 is a wasteful number, since it uses less digits than its factorization.

311223321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6698870 (or 6698868 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 311223321020 its reverse (20123322113), we get a palindrome (331346643133).

The spelling of 311223321020 in words is "three hundred eleven billion, two hundred twenty-three million, three hundred twenty-one thousand, twenty".