331220220 has 24 divisors (see below), whose sum is σ = 927416784. Its totient is φ = 88325376.

The previous prime is 331220209. The next prime is 331220243. The reversal of 331220220 is 22022133.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 331220220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2760109 + ... + 2760228.

It is an arithmetic number, because the mean of its divisors is an integer number (38642366).

Almost surely, 2^331220220 is an apocalyptic number.

331220220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

331220220 is an abundant number, since it is smaller than the sum of its proper divisors (596196564).

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

331220220 is a wasteful number, since it uses less digits than its factorization.

331220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5520349 (or 5520347 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 331220220 is about 18199.4565852940. The cubic root of 331220220 is about 691.8930164169.

Adding to 331220220 its reverse (22022133), we get a palindrome (353242353).

It can be divided in two parts, 3312 and 20220, that added together give a palindrome (23532).

The spelling of 331220220 in words is "three hundred thirty-one million, two hundred twenty thousand, two hundred twenty".