20112020111 has 4 divisors (see below), whose sum is σ = 20986455792. Its totient is φ = 19237584432.

The previous prime is 20112020083. The next prime is 20112020129. The reversal of 20112020111 is 11102021102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20112020111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112020092 and 20112020101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112020191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437217806 + ... + 437217851.

It is an arithmetic number, because the mean of its divisors is an integer number (5246613948).

Almost surely, 2^20112020111 is an apocalyptic number.

20112020111 is a deficient number, since it is larger than the sum of its proper divisors (874435681).

20112020111 is an equidigital number, since it uses as much as digits as its factorization.

20112020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874435680.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20112020111 its reverse (11102021102), we get a palindrome (31214041213).

Subtracting from 20112020111 its reverse (11102021102), we obtain a palindrome (9009999009).

The spelling of 20112020111 in words is "twenty billion, one hundred twelve million, twenty thousand, one hundred eleven".