20111123320 has 64 divisors (see below), whose sum is σ = 46033866720. Its totient is φ = 7905890304.

The previous prime is 20111123311. The next prime is 20111123423. The reversal of 20111123320 is 2332111102.

It is a junction number, because it is equal to n+sod(n) for n = 20111123294 and 20111123303.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 814192 + ... + 838528.

Almost surely, 2^20111123320 is an apocalyptic number.

20111123320 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 20111123320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23016933360).

20111123320 is an abundant number, since it is smaller than the sum of its proper divisors (25922743400).

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

20111123320 is a wasteful number, since it uses less digits than its factorization.

20111123320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24704 (or 24700 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20111123320 its reverse (2332111102), we get a palindrome (22443234422).

The spelling of 20111123320 in words is "twenty billion, one hundred eleven million, one hundred twenty-three thousand, three hundred twenty".