311013232220 has 12 divisors (see below), whose sum is σ = 653127787704. Its totient is φ = 124405292880.

The previous prime is 311013232169. The next prime is 311013232261. The reversal of 311013232220 is 22232310113.

It is a super-2 number, since 2×311013232220² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 15550661611 = 311013232220 / (3 + 1 + 1 + 0 + 1 + 3 + 2 + 3 + 2 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 311013232192 and 311013232201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7775330786 + ... + 7775330825.

It is an arithmetic number, because the mean of its divisors is an integer number (54427315642).

Almost surely, 2^311013232220 is an apocalyptic number.

It is an amenable number.

311013232220 is an abundant number, since it is smaller than the sum of its proper divisors (342114555484).

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

311013232220 is a wasteful number, since it uses less digits than its factorization.

311013232220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15550661620 (or 15550661618 counting only the distinct ones).

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

Adding to 311013232220 its reverse (22232310113), we get a palindrome (333245542333).

The spelling of 311013232220 in words is "three hundred eleven billion, thirteen million, two hundred thirty-two thousand, two hundred twenty".