331220 has 12 divisors (see below), whose sum is σ = 695604. Its totient is φ = 132480.

The previous prime is 331217. The next prime is 331231. The reversal of 331220 is 22133.

It can be written as a sum of positive squares in 2 ways, for example, as 56644 + 274576 = 238^2 + 524^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 331220.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8261 + ... + 8300.

It is an arithmetic number, because the mean of its divisors is an integer number (57967).

2³³¹²²⁰ is an apocalyptic number.

It is an amenable number.

331220 is an abundant number, since it is smaller than the sum of its proper divisors (364384).

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

331220 is a wasteful number, since it uses less digits than its factorization.

331220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16570 (or 16568 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 331220 is about 575.5171587364. The cubic root of 331220 is about 69.1892863229.

Adding to 331220 its reverse (22133), we get a palindrome (353353).

The spelling of 331220 in words is "three hundred thirty-one thousand, two hundred twenty".