31031131032220 has 48 divisors (see below), whose sum is σ = 71090112290400. Its totient is φ = 11283950488320.

The previous prime is 31031131032157. The next prime is 31031131032259. The reversal of 31031131032220 is 2223013113013.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 31031131032191 and 31031131032200.

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, 28072966 + ... + 29157394.

It is an arithmetic number, because the mean of its divisors is an integer number (1481044006050).

Almost surely, 2^{31031131032220} is an apocalyptic number.

It is an amenable number.

31031131032220 is an abundant number, since it is smaller than the sum of its proper divisors (40058981258180).

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

31031131032220 is a wasteful number, since it uses less digits than its factorization.

31031131032220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214518 (or 1214516 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31031131032220 its reverse (2223013113013), we get a palindrome (33254144145233).

The spelling of 31031131032220 in words is "thirty-one trillion, thirty-one billion, one hundred thirty-one million, thirty-two thousand, two hundred twenty".