20417317 has 4 divisors (see below), whose sum is σ = 20851776. Its totient is φ = 19982860.

The previous prime is 20417281. The next prime is 20417329. The reversal of 20417317 is 71371402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71371402 = 2 ⋅35685701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20417317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20417291 and 20417300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20417387) 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 3 ways as a sum of consecutive naturals, for example, 217159 + ... + 217252.

It is an arithmetic number, because the mean of its divisors is an integer number (5212944).

Almost surely, 2^20417317 is an apocalyptic number.

It is an amenable number.

20417317 is a deficient number, since it is larger than the sum of its proper divisors (434459).

20417317 is an equidigital number, since it uses as much as digits as its factorization.

20417317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434458.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 20417317 is about 4518.5525337214. The cubic root of 20417317 is about 273.3167348966.

Adding to 20417317 its reverse (71371402), we get a palindrome (91788719).

The spelling of 20417317 in words is "twenty million, four hundred seventeen thousand, three hundred seventeen".