31132203220 has 24 divisors (see below), whose sum is σ = 67486583808. Its totient is φ = 12051175200.

The previous prime is 31132203203. The next prime is 31132203229. The reversal of 31132203220 is 2230223113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31132203229) 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 7 ways as a sum of consecutive naturals, for example, 25105996 + ... + 25107235.

It is an arithmetic number, because the mean of its divisors is an integer number (2811940992).

Almost surely, 2^31132203220 is an apocalyptic number.

It is an amenable number.

31132203220 is an abundant number, since it is smaller than the sum of its proper divisors (36354380588).

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

31132203220 is a wasteful number, since it uses less digits than its factorization.

31132203220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50213271 (or 50213269 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 31132203220 its reverse (2230223113), we get a palindrome (33362426333).

The spelling of 31132203220 in words is "thirty-one billion, one hundred thirty-two million, two hundred three thousand, two hundred twenty".