331620020 has 96 divisors (see below), whose sum is σ = 773369856. Its totient is φ = 118886400.

The previous prime is 331620019. The next prime is 331620043. The reversal of 331620020 is 20026133.

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 769205 + ... + 769635.

It is an arithmetic number, because the mean of its divisors is an integer number (8055936).

Almost surely, 2^331620020 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 331620020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (386684928).

331620020 is an abundant number, since it is smaller than the sum of its proper divisors (441749836).

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

331620020 is a wasteful number, since it uses less digits than its factorization.

331620020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 559 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 331620020 is about 18210.4371172139. The cubic root of 331620020 is about 692.1712880804.

Adding to 331620020 its reverse (20026133), we get a palindrome (351646153).

The spelling of 331620020 in words is "three hundred thirty-one million, six hundred twenty thousand, twenty".