311331030320 has 80 divisors (see below), whose sum is σ = 728257495680. Its totient is φ = 123774508032.

The previous prime is 311331030313. The next prime is 311331030343. The reversal of 311331030320 is 23030133113.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×311331030320² (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).

It is a junction number, because it is equal to n+sod(n) for n = 311331030292 and 311331030301.

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, 16365134 + ... + 16384146.

It is an arithmetic number, because the mean of its divisors is an integer number (9103218696).

Almost surely, 2^311331030320 is an apocalyptic number.

It is an amenable number.

311331030320 is an abundant number, since it is smaller than the sum of its proper divisors (416926465360).

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

311331030320 is a wasteful number, since it uses less digits than its factorization.

311331030320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20262 (or 20256 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 20.

Adding to 311331030320 its reverse (23030133113), we get a palindrome (334361163433).

The spelling of 311331030320 in words is "three hundred eleven billion, three hundred thirty-one million, thirty thousand, three hundred twenty".