31313200023220 has 24 divisors (see below), whose sum is σ = 65758606386984. Its totient is φ = 12525111182976.

The previous prime is 31313200023151. The next prime is 31313200023221. The reversal of 31313200023220 is 2232000231313.

It can be written as a sum of positive squares in 4 ways, for example, as 3303575245476 + 28009624777744 = 1817574^2 + 5292412^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31313200023191 and 31313200023200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31313200023221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9025359 + ... + 12003478.

It is an arithmetic number, because the mean of its divisors is an integer number (2739941932791).

Almost surely, 2^{31313200023220} is an apocalyptic number.

It is an amenable number.

31313200023220 is an abundant number, since it is smaller than the sum of its proper divisors (34445406363764).

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

31313200023220 is a wasteful number, since it uses less digits than its factorization.

31313200023220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21103299 (or 21103297 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 31313200023220 its reverse (2232000231313), we get a palindrome (33545200254533).

The spelling of 31313200023220 in words is "thirty-one trillion, three hundred thirteen billion, two hundred million, twenty-three thousand, two hundred twenty".