20838717 has 6 divisors (see below), whose sum is σ = 30100382. Its totient is φ = 13892472.

The previous prime is 20838707. The next prime is 20838721. The reversal of 20838717 is 71783802.

It can be written as a sum of positive squares in only one way, i.e., 20602521 + 236196 = 4539^2 + 486^2 .

It is not a de Polignac number, because 20838717 - 2⁷ = 20838589 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 (20838707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1157698 + ... + 1157715.

Almost surely, 2^20838717 is an apocalyptic number.

It is an amenable number.

20838717 is a deficient number, since it is larger than the sum of its proper divisors (9261665).

20838717 is a wasteful number, since it uses less digits than its factorization.

20838717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315419 (or 2315416 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 20838717 is about 4564.9443589161. The cubic root of 20838717 is about 275.1843040007.

The spelling of 20838717 in words is "twenty million, eight hundred thirty-eight thousand, seven hundred seventeen".