331220030020 has 36 divisors (see below), whose sum is σ = 764543430252. Its totient is φ = 120443646400.

The previous prime is 331220029999. The next prime is 331220030023. The reversal of 331220030020 is 20030022133.

It can be written as a sum of positive squares in 2 ways, for example, as 144070348356 + 187149681664 = 379566^2 + 432608^2 .

It is a junction number, because it is equal to n+sod(n) for n = 331220029976 and 331220030003.

It is not an unprimeable number, because it can be changed into a prime (331220030023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68431471 + ... + 68436310.

It is an arithmetic number, because the mean of its divisors is an integer number (21237317507).

Almost surely, 2^331220030020 is an apocalyptic number.

It is an amenable number.

331220030020 is an abundant number, since it is smaller than the sum of its proper divisors (433323400232).

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

331220030020 is a wasteful number, since it uses less digits than its factorization.

331220030020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136867812 (or 136867799 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 331220030020 its reverse (20030022133), we get a palindrome (351250052153).

The spelling of 331220030020 in words is "three hundred thirty-one billion, two hundred twenty million, thirty thousand, twenty".