31323032220 has 24 divisors (see below), whose sum is σ = 87704490384. Its totient is φ = 8352808576.

The previous prime is 31323032201. The next prime is 31323032249. The reversal of 31323032220 is 2223032313.

It is a super-2 number, since 2×31323032220² (a number of 22 digits) contains 22 as substring.

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, 261025209 + ... + 261025328.

It is an arithmetic number, because the mean of its divisors is an integer number (3654353766).

Almost surely, 2^31323032220 is an apocalyptic number.

31323032220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31323032220 is an abundant number, since it is smaller than the sum of its proper divisors (56381458164).

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

31323032220 is a wasteful number, since it uses less digits than its factorization.

31323032220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522050549 (or 522050547 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 21.

Adding to 31323032220 its reverse (2223032313), we get a palindrome (33546064533).

The spelling of 31323032220 in words is "thirty-one billion, three hundred twenty-three million, thirty-two thousand, two hundred twenty".