331243220 has 96 divisors (see below), whose sum is σ = 897281280. Its totient is φ = 99671040.

The previous prime is 331243193. The next prime is 331243271. The reversal of 331243220 is 22342133.

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 = 331243192 and 331243201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40952 + ... + 48368.

It is an arithmetic number, because the mean of its divisors is an integer number (9346680).

Almost surely, 2^331243220 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 331243220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (448640640).

331243220 is an abundant number, since it is smaller than the sum of its proper divisors (566038060).

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

331243220 is a wasteful number, since it uses less digits than its factorization.

331243220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7473 (or 7471 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 331243220 is about 18200.0884613235. The cubic root of 331243220 is about 691.9090311105.

Adding to 331243220 its reverse (22342133), we get a palindrome (353585353).

The spelling of 331243220 in words is "three hundred thirty-one million, two hundred forty-three thousand, two hundred twenty".