20111117 has 4 divisors (see below), whose sum is σ = 21658140. Its totient is φ = 18564096.

The previous prime is 20111093. The next prime is 20111137. The reversal of 20111117 is 71111102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12432676 + 7678441 = 3526^2 + 2771^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111117 - 2⁶ = 20111053 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 (20111137) 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, 773492 + ... + 773517.

It is an arithmetic number, because the mean of its divisors is an integer number (5414535).

Almost surely, 2^20111117 is an apocalyptic number.

It is an amenable number.

20111117 is a deficient number, since it is larger than the sum of its proper divisors (1547023).

20111117 is a wasteful number, since it uses less digits than its factorization.

20111117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547022.

The product of its (nonzero) digits is 14, while the sum is 14.

The square root of 20111117 is about 4484.5420056010. The cubic root of 20111117 is about 271.9435301240.

Adding to 20111117 its reverse (71111102), we get a palindrome (91222219).

The spelling of 20111117 in words is "twenty million, one hundred eleven thousand, one hundred seventeen".