20123324320 has 144 divisors (see below), whose sum is σ = 55094927328. Its totient is φ = 6886952960.

The previous prime is 20123324279. The next prime is 20123324369. The reversal of 20123324320 is 2342332102.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 20123324291 and 20123324300.

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, 488859 + ... + 528421.

It is an arithmetic number, because the mean of its divisors is an integer number (382603662).

Almost surely, 2^20123324320 is an apocalyptic number.

20123324320 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 20123324320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27547463664).

20123324320 is an abundant number, since it is smaller than the sum of its proper divisors (34971603008).

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

20123324320 is a wasteful number, since it uses less digits than its factorization.

20123324320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39623 (or 39598 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 20123324320 its reverse (2342332102), we get a palindrome (22465656422).

It can be divided in two parts, 20123 and 324320, that added together give a palindrome (344443).

The spelling of 20123324320 in words is "twenty billion, one hundred twenty-three million, three hundred twenty-four thousand, three hundred twenty".