20118911 has 2 divisors, whose sum is σ = 20118912. Its totient is φ = 20118910.

The previous prime is 20118881. The next prime is 20118913. The reversal of 20118911 is 11981102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20118911 - 2¹⁴ = 20102527 is a prime.

Together with 20118913, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20118913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10059455 + 10059456.

It is an arithmetic number, because the mean of its divisors is an integer number (10059456).

Almost surely, 2^20118911 is an apocalyptic number.

20118911 is a deficient number, since it is larger than the sum of its proper divisors (1).

20118911 is an equidigital number, since it uses as much as digits as its factorization.

20118911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 23.

The square root of 20118911 is about 4485.4109064834. The cubic root of 20118911 is about 271.9786558727.

The spelling of 20118911 in words is "twenty million, one hundred eighteen thousand, nine hundred eleven".