20317999 has 8 divisors (see below), whose sum is σ = 22190112. Its totient is φ = 18490080.

The previous prime is 20317991. The next prime is 20318003. The reversal of 20317999 is 99971302.

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 20317999 - 2³ = 20317991 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 (20317991) 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, 10084 + ... + 11929.

It is an arithmetic number, because the mean of its divisors is an integer number (2773764).

Almost surely, 2^20317999 is an apocalyptic number.

20317999 is a deficient number, since it is larger than the sum of its proper divisors (1872113).

20317999 is a wasteful number, since it uses less digits than its factorization.

20317999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22097.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 20317999 is about 4507.5491123226. The cubic root of 20317999 is about 272.8728403672.

It can be divided in two parts, 20317 and 999, that added together give a square (21316 = 146²).

The spelling of 20317999 in words is "twenty million, three hundred seventeen thousand, nine hundred ninety-nine".