331013023220 has 144 divisors (see below), whose sum is σ = 805335184080. Its totient is φ = 114023669760.

The previous prime is 331013023217. The next prime is 331013023241. The reversal of 331013023220 is 22320310133.

It can be written as a sum of positive squares in 8 ways, for example, as 39851338384 + 291161684836 = 199628^2 + 539594^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 331013023192 and 331013023201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3675044 + ... + 3764036.

It is an arithmetic number, because the mean of its divisors is an integer number (5592605445).

Almost surely, 2^331013023220 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 331013023220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (402667592040).

331013023220 is an abundant number, since it is smaller than the sum of its proper divisors (474322160860).

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

331013023220 is a wasteful number, since it uses less digits than its factorization.

331013023220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89106 (or 89093 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 331013023220 its reverse (22320310133), we get a palindrome (353333333353).

The spelling of 331013023220 in words is "three hundred thirty-one billion, thirteen million, twenty-three thousand, two hundred twenty".