331530220 has 96 divisors (see below), whose sum is σ = 816012288. Its totient is φ = 110806272.

The previous prime is 331530217. The next prime is 331530229. The reversal of 331530220 is 22035133.

It is not an unprimeable number, because it can be changed into a prime (331530229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1196722 + ... + 1196998.

It is an arithmetic number, because the mean of its divisors is an integer number (8500128).

Almost surely, 2^331530220 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 331530220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (408006144).

331530220 is an abundant number, since it is smaller than the sum of its proper divisors (484482068).

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

331530220 is a wasteful number, since it uses less digits than its factorization.

331530220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 477 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 19.

The square root of 331530220 is about 18207.9713312604. The cubic root of 331530220 is about 692.1088043246.

Adding to 331530220 its reverse (22035133), we get a palindrome (353565353).

The spelling of 331530220 in words is "three hundred thirty-one million, five hundred thirty thousand, two hundred twenty".