20368209 has 16 divisors (see below), whose sum is σ = 29511680. Its totient is φ = 12448080.

The previous prime is 20368177. The next prime is 20368211. The reversal of 20368209 is 90286302.

It is not a de Polignac number, because 20368209 - 2⁵ = 20368177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20368219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3997 + ... + 7530.

It is an arithmetic number, because the mean of its divisors is an integer number (1844480).

Almost surely, 2^20368209 is an apocalyptic number.

It is an amenable number.

20368209 is a deficient number, since it is larger than the sum of its proper divisors (9143471).

20368209 is a wasteful number, since it uses less digits than its factorization.

20368209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11580.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 20368209 is about 4513.1152212192. The cubic root of 20368209 is about 273.0974306401.

The spelling of 20368209 in words is "twenty million, three hundred sixty-eight thousand, two hundred nine".