20001232320 has 56 divisors (see below), whose sum is σ = 63503915664. Its totient is φ = 5333661696.

The previous prime is 20001232261. The next prime is 20001232357. The reversal of 20001232320 is 2323210002.

It is a super-2 number, since 2×20001232320² (a number of 21 digits) contains 22 as substring.

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 20001232320.

It is a congruent number.

It is an unprimeable number.

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, 10416349 + ... + 10418268.

It is an arithmetic number, because the mean of its divisors is an integer number (1133998494).

Almost surely, 2^20001232320 is an apocalyptic number.

20001232320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20001232320 is an abundant number, since it is smaller than the sum of its proper divisors (43502683344).

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

20001232320 is a wasteful number, since it uses less digits than its factorization.

20001232320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20834637 (or 20834627 counting only the distinct ones).

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

Adding to 20001232320 its reverse (2323210002), we get a palindrome (22324442322).

The spelling of 20001232320 in words is "twenty billion, one million, two hundred thirty-two thousand, three hundred twenty".