20320739320 has 128 divisors (see below), whose sum is σ = 54013132800. Its totient is φ = 6733094400.

The previous prime is 20320739281. The next prime is 20320739323. The reversal of 20320739320 is 2393702302.

It is a super-2 number, since 2×20320739320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320739323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9625065 + ... + 9627175.

It is an arithmetic number, because the mean of its divisors is an integer number (421977600).

Almost surely, 2^20320739320 is an apocalyptic number.

20320739320 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 20320739320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27006566400).

20320739320 is an abundant number, since it is smaller than the sum of its proper divisors (33692393480).

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

20320739320 is a wasteful number, since it uses less digits than its factorization.

20320739320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3269 (or 3265 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 31.

The spelling of 20320739320 in words is "twenty billion, three hundred twenty million, seven hundred thirty-nine thousand, three hundred twenty".