20323311320 has 96 divisors (see below), whose sum is σ = 50723910720. Its totient is φ = 7320867840.

The previous prime is 20323311301. The next prime is 20323311341. The reversal of 20323311320 is 2311332302.

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 = 20323311292 and 20323311301.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 240497 + ... + 313823.

It is an arithmetic number, because the mean of its divisors is an integer number (528374070).

Almost surely, 2^20323311320 is an apocalyptic number.

20323311320 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 20323311320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25361955360).

20323311320 is an abundant number, since it is smaller than the sum of its proper divisors (30400599400).

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

20323311320 is a wasteful number, since it uses less digits than its factorization.

20323311320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73405 (or 73388 counting only the distinct ones).

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

Adding to 20323311320 its reverse (2311332302), we get a palindrome (22634643622).

The spelling of 20323311320 in words is "twenty billion, three hundred twenty-three million, three hundred eleven thousand, three hundred twenty".