2001322320 has 80 divisors (see below), whose sum is σ = 6224280192. Its totient is φ = 531950080.

The previous prime is 2001322291. The next prime is 2001322363. The reversal of 2001322320 is 232231002.

It is a tau number, because it is divible by the number of its divisors (80).

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 2001322320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61234 + ... + 88046.

Almost surely, 2^2001322320 is an apocalyptic number.

2001322320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2001322320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3112140096).

2001322320 is an abundant number, since it is smaller than the sum of its proper divisors (4222957872).

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

2001322320 is a wasteful number, since it uses less digits than its factorization.

2001322320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27140 (or 27134 counting only the distinct ones).

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

The square root of 2001322320 is about 44736.1410941981. The cubic root of 2001322320 is about 1260.1986585231.

Adding to 2001322320 its reverse (232231002), we get a palindrome (2233553322).

The spelling of 2001322320 in words is "two billion, one million, three hundred twenty-two thousand, three hundred twenty".