20113113111 has 16 divisors (see below), whose sum is σ = 33006134784. Its totient is φ = 10609114464.

The previous prime is 20113113107. The next prime is 20113113127. The reversal of 20113113111 is 11131131102.

It is not a de Polignac number, because 20113113111 - 2² = 20113113107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113113211) 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 15 ways as a sum of consecutive naturals, for example, 36836931 + ... + 36837476.

It is an arithmetic number, because the mean of its divisors is an integer number (2062883424).

Almost surely, 2^20113113111 is an apocalyptic number.

20113113111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20113113111 is a deficient number, since it is larger than the sum of its proper divisors (12893021673).

20113113111 is a wasteful number, since it uses less digits than its factorization.

20113113111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73674430.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 20113113111 its reverse (11131131102), we get a palindrome (31244244213).

The spelling of 20113113111 in words is "twenty billion, one hundred thirteen million, one hundred thirteen thousand, one hundred eleven".