20900111 has 4 divisors (see below), whose sum is σ = 20922072. Its totient is φ = 20878152.

The previous prime is 20900093. The next prime is 20900149. The reversal of 20900111 is 11100902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20900111 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 (20900911) 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, 9485 + ... + 11478.

It is an arithmetic number, because the mean of its divisors is an integer number (5230518).

Almost surely, 2^20900111 is an apocalyptic number.

20900111 is a deficient number, since it is larger than the sum of its proper divisors (21961).

20900111 is an equidigital number, since it uses as much as digits as its factorization.

20900111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21960.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 20900111 is about 4571.6639202811. The cubic root of 20900111 is about 275.4542838473.

The spelling of 20900111 in words is "twenty million, nine hundred thousand, one hundred eleven".