331220020 has 24 divisors (see below), whose sum is σ = 719548200. Its totient is φ = 127919232.

The previous prime is 331220009. The next prime is 331220023. The reversal of 331220020 is 20022133.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8514724 + 322705296 = 2918^2 + 17964^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331220023) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 284955 + ... + 286114.

It is an arithmetic number, because the mean of its divisors is an integer number (29981175).

Almost surely, 2^331220020 is an apocalyptic number.

It is an amenable number.

331220020 is an abundant number, since it is smaller than the sum of its proper divisors (388328180).

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

331220020 is a wasteful number, since it uses less digits than its factorization.

331220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571107 (or 571105 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 331220020 is about 18199.4510906236. The cubic root of 331220020 is about 691.8928771554.

Adding to 331220020 its reverse (20022133), we get a palindrome (351242153).

It can be divided in two parts, 3312 and 20020, that added together give a palindrome (23332).

The spelling of 331220020 in words is "three hundred thirty-one million, two hundred twenty thousand, twenty".