20668317 has 8 divisors (see below), whose sum is σ = 27580320. Its totient is φ = 13767600.

The previous prime is 20668279. The next prime is 20668331. The reversal of 20668317 is 71386602.

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

It is not a de Polignac number, because 20668317 - 2⁷ = 20668189 is a prime.

It is a super-2 number, since 2×20668317² = 854358655224978, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20668367) 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 7 ways as a sum of consecutive naturals, for example, 3442 + ... + 7292.

It is an arithmetic number, because the mean of its divisors is an integer number (3447540).

Almost surely, 2^20668317 is an apocalyptic number.

It is an amenable number.

20668317 is a deficient number, since it is larger than the sum of its proper divisors (6912003).

20668317 is a wasteful number, since it uses less digits than its factorization.

20668317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5643.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 20668317 is about 4546.2420745051. The cubic root of 20668317 is about 274.4321815466.

The spelling of 20668317 in words is "twenty million, six hundred sixty-eight thousand, three hundred seventeen".