320331231220 has 192 divisors, whose sum is σ = 903792992256. Its totient is φ = 92102699520.

The previous prime is 320331231211. The next prime is 320331231263. The reversal of 320331231220 is 22132133023.

It is a super-2 number, since 2×320331231220² (a number of 24 digits) contains 22 as substring.

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 = 320331231191 and 320331231200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 36972609 + ... + 36981271.

It is an arithmetic number, because the mean of its divisors is an integer number (4707255168).

Almost surely, 2^320331231220 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 320331231220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (451896496128).

320331231220 is an abundant number, since it is smaller than the sum of its proper divisors (583461761036).

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

320331231220 is a wasteful number, since it uses less digits than its factorization.

320331231220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10550 (or 10548 counting only the distinct ones).

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

Adding to 320331231220 its reverse (22132133023), we get a palindrome (342463364243).

The spelling of 320331231220 in words is "three hundred twenty billion, three hundred thirty-one million, two hundred thirty-one thousand, two hundred twenty".