20320344320 has 72 divisors (see below), whose sum is σ = 49128799104. Its totient is φ = 8052119552.

The previous prime is 20320344301. The next prime is 20320344347. The reversal of 20320344320 is 2344302302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62777 + ... + 211143.

It is an arithmetic number, because the mean of its divisors is an integer number (682344432).

Almost surely, 2^20320344320 is an apocalyptic number.

20320344320 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 20320344320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24564399552).

20320344320 is an abundant number, since it is smaller than the sum of its proper divisors (28808454784).

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

20320344320 is a wasteful number, since it uses less digits than its factorization.

20320344320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148495 (or 148481 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 23.

Adding to 20320344320 its reverse (2344302302), we get a palindrome (22664646622).

The spelling of 20320344320 in words is "twenty billion, three hundred twenty million, three hundred forty-four thousand, three hundred twenty".