20123112320 has 128 divisors (see below), whose sum is σ = 49268766240. Its totient is φ = 7857045504.

The previous prime is 20123112311. The next prime is 20123112323. The reversal of 20123112320 is 2321132102.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123112323) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4843364 + ... + 4847516.

Almost surely, 2^20123112320 is an apocalyptic number.

20123112320 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 20123112320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24634383120).

20123112320 is an abundant number, since it is smaller than the sum of its proper divisors (29145653920).

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

20123112320 is a wasteful number, since it uses less digits than its factorization.

20123112320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4352 (or 4340 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20123112320 its reverse (2321132102), we get a palindrome (22444244422).

The spelling of 20123112320 in words is "twenty billion, one hundred twenty-three million, one hundred twelve thousand, three hundred twenty".