20111113 has 4 divisors (see below), whose sum is σ = 21939408. Its totient is φ = 18282820.

The previous prime is 20111093. The next prime is 20111137. The reversal of 20111113 is 31111102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20111113 - 2⁵ = 20111081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20111113.

It is not an unprimeable number, because it can be changed into a prime (20111183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914131 + ... + 914152.

It is an arithmetic number, because the mean of its divisors is an integer number (5484852).

Almost surely, 2^20111113 is an apocalyptic number.

It is an amenable number.

20111113 is a deficient number, since it is larger than the sum of its proper divisors (1828295).

20111113 is a wasteful number, since it uses less digits than its factorization.

20111113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828294.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 20111113 is about 4484.5415596246. The cubic root of 20111113 is about 271.9435120946.

Adding to 20111113 its reverse (31111102), we get a palindrome (51222215).

The spelling of 20111113 in words is "twenty million, one hundred eleven thousand, one hundred thirteen".