331220320 has 96 divisors (see below), whose sum is σ = 805865760. Its totient is φ = 128593920.

The previous prime is 331220311. The next prime is 331220341. The reversal of 331220320 is 23022133.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 331220294 and 331220303.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1178580 + ... + 1178860.

It is an arithmetic number, because the mean of its divisors is an integer number (8394435).

Almost surely, 2^331220320 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 331220320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (402932880).

331220320 is an abundant number, since it is smaller than the sum of its proper divisors (474645440).

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

331220320 is a wasteful number, since it uses less digits than its factorization.

331220320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488 (or 480 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 331220320 is about 18199.4593326285. The cubic root of 331220320 is about 691.8930860476.

Adding to 331220320 its reverse (23022133), we get a palindrome (354242453).

It can be divided in two parts, 3312 and 20320, that added together give a palindrome (23632).

The spelling of 331220320 in words is "three hundred thirty-one million, two hundred twenty thousand, three hundred twenty".