31323420313220 has 144 divisors (see below), whose sum is σ = 76727639862720. Its totient is φ = 10710143136000.

The previous prime is 31323420313193. The next prime is 31323420313231. The reversal of 31323420313220 is 2231302432313.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1367763770 + ... + 1367786670.

It is an arithmetic number, because the mean of its divisors is an integer number (532830832380).

Almost surely, 2^{31323420313220} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31323420313220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38363819931360).

31323420313220 is an abundant number, since it is smaller than the sum of its proper divisors (45404219549500).

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

31323420313220 is a wasteful number, since it uses less digits than its factorization.

31323420313220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26674 (or 26665 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 29.

Adding to 31323420313220 its reverse (2231302432313), we get a palindrome (33554722745533).

The spelling of 31323420313220 in words is "thirty-one trillion, three hundred twenty-three billion, four hundred twenty million, three hundred thirteen thousand, two hundred twenty".