20135717 has 12 divisors (see below), whose sum is σ = 23710176. Its totient is φ = 17047800.

The previous prime is 20135683. The next prime is 20135737. The reversal of 20135717 is 71753102.

It is not a de Polignac number, because 20135717 - 2²⁴ = 3358501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20135737) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1592 + ... + 6542.

It is an arithmetic number, because the mean of its divisors is an integer number (1975848).

Almost surely, 2^20135717 is an apocalyptic number.

It is an amenable number.

20135717 is a deficient number, since it is larger than the sum of its proper divisors (3574459).

20135717 is an equidigital number, since it uses as much as digits as its factorization.

20135717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5048 (or 5041 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 20135717 is about 4487.2839223744. The cubic root of 20135717 is about 272.0543657549.

Adding to 20135717 its reverse (71753102), we get a palindrome (91888819).

The spelling of 20135717 in words is "twenty million, one hundred thirty-five thousand, seven hundred seventeen".