31000220320220 has 24 divisors (see below), whose sum is σ = 65100615514704. Its totient is φ = 12400059015296.

The previous prime is 31000220320103. The next prime is 31000220320247. The reversal of 31000220320220 is 2202302200013.

It is a super-2 number, since 2×31000220320220² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 8279099 + ... + 11425581.

It is an arithmetic number, because the mean of its divisors is an integer number (2712525646446).

Almost surely, 2^{31000220320220} is an apocalyptic number.

It is an amenable number.

31000220320220 is an abundant number, since it is smaller than the sum of its proper divisors (34100395194484).

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

31000220320220 is a wasteful number, since it uses less digits than its factorization.

31000220320220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3639109 (or 3639107 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 31000220320220 its reverse (2202302200013), we get a palindrome (33202522520233).

The spelling of 31000220320220 in words is "thirty-one trillion, two hundred twenty million, three hundred twenty thousand, two hundred twenty".