31111143320 has 32 divisors (see below), whose sum is σ = 70005550320. Its totient is φ = 12443483520.

The previous prime is 31111143319. The next prime is 31111143353. The reversal of 31111143320 is 2334111113.

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 = 31111143292 and 31111143301.

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, 708815 + ... + 751425.

Almost surely, 2^31111143320 is an apocalyptic number.

It is an amenable number.

31111143320 is an abundant number, since it is smaller than the sum of its proper divisors (38894407000).

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

31111143320 is a wasteful number, since it uses less digits than its factorization.

31111143320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60875 (or 60871 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31111143320 its reverse (2334111113), we get a palindrome (33445254433).

The spelling of 31111143320 in words is "thirty-one billion, one hundred eleven million, one hundred forty-three thousand, three hundred twenty".