20123111112 has 32 divisors (see below), whose sum is σ = 54177607680. Its totient is φ = 6191726400.

The previous prime is 20123111093. The next prime is 20123111117. The reversal of 20123111112 is 21111132102.

It is a junction number, because it is equal to n+sod(n) for n = 20123111091 and 20123111100.

It is not an unprimeable number, because it can be changed into a prime (20123111117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32248264 + ... + 32248887.

It is an arithmetic number, because the mean of its divisors is an integer number (1693050240).

Almost surely, 2^20123111112 is an apocalyptic number.

It is an amenable number.

20123111112 is an abundant number, since it is smaller than the sum of its proper divisors (34054496568).

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

20123111112 is a wasteful number, since it uses less digits than its factorization.

20123111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64497173 (or 64497169 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 20123111112 its reverse (21111132102), we get a palindrome (41234243214).

The spelling of 20123111112 in words is "twenty billion, one hundred twenty-three million, one hundred eleven thousand, one hundred twelve".