20316909 has 16 divisors (see below), whose sum is σ = 28615680. Its totient is φ = 12786480.

The previous prime is 20316893. The next prime is 20316911. The reversal of 20316909 is 90961302.

It is not a de Polignac number, because 20316909 - 2⁴ = 20316893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20316929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24154 + ... + 24980.

It is an arithmetic number, because the mean of its divisors is an integer number (1788480).

Almost surely, 2^20316909 is an apocalyptic number.

It is an amenable number.

20316909 is a deficient number, since it is larger than the sum of its proper divisors (8298771).

20316909 is a wasteful number, since it uses less digits than its factorization.

20316909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 20316909 is about 4507.4282024232. The cubic root of 20316909 is about 272.8679606755.

The spelling of 20316909 in words is "twenty million, three hundred sixteen thousand, nine hundred nine".