20345717 has 8 divisors (see below), whose sum is σ = 23819712. Its totient is φ = 17013600.

The previous prime is 20345687. The next prime is 20345723. The reversal of 20345717 is 71754302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20345717 - 2²⁴ = 3568501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20345717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20345747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35159 + ... + 35732.

It is an arithmetic number, because the mean of its divisors is an integer number (2977464).

Almost surely, 2^20345717 is an apocalyptic number.

It is an amenable number.

20345717 is a deficient number, since it is larger than the sum of its proper divisors (3473995).

20345717 is an equidigital number, since it uses as much as digits as its factorization.

20345717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70939.

The product of its (nonzero) digits is 5880, while the sum is 29.

The square root of 20345717 is about 4510.6226842865. The cubic root of 20345717 is about 272.9968691917.

The spelling of 20345717 in words is "twenty million, three hundred forty-five thousand, seven hundred seventeen".