31431716220 has 48 divisors (see below), whose sum is σ = 88500504960. Its totient is φ = 8334962496.

The previous prime is 31431716213. The next prime is 31431716237. The reversal of 31431716220 is 2261713413.

It is a happy number.

It is a super-2 number, since 2×31431716220² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 1452562 + ... + 1474041.

It is an arithmetic number, because the mean of its divisors is an integer number (1843760520).

Almost surely, 2^31431716220 is an apocalyptic number.

31431716220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31431716220 is an abundant number, since it is smaller than the sum of its proper divisors (57068788740).

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

31431716220 is a wasteful number, since it uses less digits than its factorization.

31431716220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2926794 (or 2926792 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The spelling of 31431716220 in words is "thirty-one billion, four hundred thirty-one million, seven hundred sixteen thousand, two hundred twenty".