20311113312 has 192 divisors, whose sum is σ = 67890009600. Its totient is φ = 5787210240.

The previous prime is 20311113289. The next prime is 20311113313. The reversal of 20311113312 is 21331111302.

20311113312 is a `hidden beast` number, since 20 + 311 + 1 + 1 + 331 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311113313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2287762 + ... + 2296622.

It is an arithmetic number, because the mean of its divisors is an integer number (353593800).

Almost surely, 2^20311113312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20311113312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33945004800).

20311113312 is an abundant number, since it is smaller than the sum of its proper divisors (47578896288).

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

20311113312 is a wasteful number, since it uses less digits than its factorization.

20311113312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9266 (or 9252 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 20311113312 its reverse (21331111302), we get a palindrome (41642224614).

The spelling of 20311113312 in words is "twenty billion, three hundred eleven million, one hundred thirteen thousand, three hundred twelve".