19917317 has 8 divisors (see below), whose sum is σ = 22895616. Its totient is φ = 16972272.

The previous prime is 19917311. The next prime is 19917329. The reversal of 19917317 is 71371991.

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 19917317 - 2⁸ = 19917061 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 (19917311) 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 7 ways as a sum of consecutive naturals, for example, 7013 + ... + 9434.

It is an arithmetic number, because the mean of its divisors is an integer number (2861952).

Almost surely, 2^19917317 is an apocalyptic number.

It is an amenable number.

19917317 is a deficient number, since it is larger than the sum of its proper divisors (2978299).

19917317 is a wasteful number, since it uses less digits than its factorization.

19917317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16627.

The product of its digits is 11907, while the sum is 38.

The square root of 19917317 is about 4462.8821405007. The cubic root of 19917317 is about 271.0671846788.

The spelling of 19917317 in words is "nineteen million, nine hundred seventeen thousand, three hundred seventeen".