31145334220 has 96 divisors (see below), whose sum is σ = 87816830976. Its totient is φ = 8960889600.

The previous prime is 31145334203. The next prime is 31145334263. The reversal of 31145334220 is 2243354113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 757836 + ... + 797875.

It is an arithmetic number, because the mean of its divisors is an integer number (914758656).

Almost surely, 2^31145334220 is an apocalyptic number.

It is an amenable number.

31145334220 is an abundant number, since it is smaller than the sum of its proper divisors (56671496756).

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

31145334220 is a wasteful number, since it uses less digits than its factorization.

31145334220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555751 (or 1555749 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

Adding to 31145334220 its reverse (2243354113), we get a palindrome (33388688333).

It can be divided in two parts, 3114533 and 4220, that added together give a triangular number (3118753 = T₂₄₉₇).

The spelling of 31145334220 in words is "thirty-one billion, one hundred forty-five million, three hundred thirty-four thousand, two hundred twenty".