31323101200220 has 48 divisors (see below), whose sum is σ = 66212342814240. Its totient is φ = 12446746569984.

The previous prime is 31323101200211. The next prime is 31323101200241. The reversal of 31323101200220 is 2200210132313.

It is a super-2 number, since 2×31323101200220² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31323101200192 and 31323101200201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 818639 + ... + 7957158.

It is an arithmetic number, because the mean of its divisors is an integer number (1379423808630).

Almost surely, 2^{31323101200220} is an apocalyptic number.

It is an amenable number.

31323101200220 is an abundant number, since it is smaller than the sum of its proper divisors (34889241614020).

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

31323101200220 is a wasteful number, since it uses less digits than its factorization.

31323101200220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8776982 (or 8776980 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31323101200220 its reverse (2200210132313), we get a palindrome (33523311332533).

The spelling of 31323101200220 in words is "thirty-one trillion, three hundred twenty-three billion, one hundred one million, two hundred thousand, two hundred twenty".