20113312120 has 96 divisors (see below), whose sum is σ = 51348044160. Its totient is φ = 7077945600.

The previous prime is 20113312111. The next prime is 20113312217. The reversal of 20113312120 is 2121331102.

It is a junction number, because it is equal to n+sod(n) for n = 20113312094 and 20113312103.

It is a congruent number.

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, 83014 + ... + 217066.

It is an arithmetic number, because the mean of its divisors is an integer number (534875460).

Almost surely, 2^20113312120 is an apocalyptic number.

20113312120 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 20113312120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25674022080).

20113312120 is an abundant number, since it is smaller than the sum of its proper divisors (31234732040).

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

20113312120 is a wasteful number, since it uses less digits than its factorization.

20113312120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134117 (or 134102 counting only the distinct ones).

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

Adding to 20113312120 its reverse (2121331102), we get a palindrome (22234643222).

It can be divided in two parts, 20113 and 312120, that added together give a palindrome (332233).

The spelling of 20113312120 in words is "twenty billion, one hundred thirteen million, three hundred twelve thousand, one hundred twenty".