20001111100111 has 4 divisors (see below), whose sum is σ = 20001121703032. Its totient is φ = 20001100497192.

The previous prime is 20001111100057. The next prime is 20001111100129. The reversal of 20001111100111 is 11100111110002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20001111100111 - 2¹¹ = 20001111098063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001111100141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1619496 + ... + 6528781.

It is an arithmetic number, because the mean of its divisors is an integer number (5000280425758).

Almost surely, 2^{20001111100111} is an apocalyptic number.

20001111100111 is a deficient number, since it is larger than the sum of its proper divisors (10602921).

20001111100111 is an equidigital number, since it uses as much as digits as its factorization.

20001111100111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10602920.

The product of its (nonzero) digits is 2, while the sum is 10.

Adding to 20001111100111 its reverse (11100111110002), we get a palindrome (31101222210113).

The spelling of 20001111100111 in words is "twenty trillion, one billion, one hundred eleven million, one hundred thousand, one hundred eleven".