31313303220 has 48 divisors (see below), whose sum is σ = 87685899840. Its totient is φ = 8349390336.

The previous prime is 31313303213. The next prime is 31313303239. The reversal of 31313303220 is 2230331313.

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, 813571 + ... + 851189.

It is an arithmetic number, because the mean of its divisors is an integer number (1826789580).

Almost surely, 2^31313303220 is an apocalyptic number.

31313303220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31313303220 is an abundant number, since it is smaller than the sum of its proper divisors (56372596620).

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

31313303220 is a wasteful number, since it uses less digits than its factorization.

31313303220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51504 (or 51502 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 21.

Adding to 31313303220 its reverse (2230331313), we get a palindrome (33543634533).

The spelling of 31313303220 in words is "thirty-one billion, three hundred thirteen million, three hundred three thousand, two hundred twenty".