20111118 has 16 divisors (see below), whose sum is σ = 40320336. Its totient is φ = 6687360.

The previous prime is 20111093. The next prime is 20111137. The reversal of 20111118 is 81111102.

It is a junction number, because it is equal to n+sod(n) for n = 20111097 and 20111106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1273 + ... + 6468.

It is an arithmetic number, because the mean of its divisors is an integer number (2520021).

Almost surely, 2^20111118 is an apocalyptic number.

20111118 is an abundant number, since it is smaller than the sum of its proper divisors (20209218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111118 is a wasteful number, since it uses less digits than its factorization.

20111118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8179.

The product of its (nonzero) digits is 16, while the sum is 15.

The square root of 20111118 is about 4484.5421170951. The cubic root of 20111118 is about 271.9435346313.

Subtracting from 20111118 its product of nonzero digits (16), we obtain a palindrome (20111102).

The spelling of 20111118 in words is "twenty million, one hundred eleven thousand, one hundred eighteen".