31331440220 has 48 divisors (see below), whose sum is σ = 68578019328. Its totient is φ = 12010524480.

The previous prime is 31331440207. The next prime is 31331440223. The reversal of 31331440220 is 2204413313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31331440223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181454 + ... + 309173.

It is an arithmetic number, because the mean of its divisors is an integer number (1428708736).

Almost surely, 2^31331440220 is an apocalyptic number.

It is an amenable number.

31331440220 is an abundant number, since it is smaller than the sum of its proper divisors (37246579108).

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

31331440220 is a wasteful number, since it uses less digits than its factorization.

31331440220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490770 (or 490768 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 31331440220 its reverse (2204413313), we get a palindrome (33535853533).

The spelling of 31331440220 in words is "thirty-one billion, three hundred thirty-one million, four hundred forty thousand, two hundred twenty".