20906111 has 2 divisors, whose sum is σ = 20906112. Its totient is φ = 20906110.

The previous prime is 20906087. The next prime is 20906143. The reversal of 20906111 is 11160902.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20906111 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20906191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10453055 + 10453056.

It is an arithmetic number, because the mean of its divisors is an integer number (10453056).

Almost surely, 2^20906111 is an apocalyptic number.

20906111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20906111 is an equidigital number, since it uses as much as digits as its factorization.

20906111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 20906111 is about 4572.3200894076. The cubic root of 20906111 is about 275.4806404469.

The spelling of 20906111 in words is "twenty million, nine hundred six thousand, one hundred eleven".