20118317 has 4 divisors (see below), whose sum is σ = 20129340. Its totient is φ = 20107296.

The previous prime is 20118311. The next prime is 20118341. The reversal of 20118317 is 71381102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18412681 + 1705636 = 4291^2 + 1306^2 .

It is a cyclic number.

It is not a de Polignac number, because 20118317 - 2⁶ = 20118253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20118292 and 20118301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20118311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2048 + ... + 6665.

It is an arithmetic number, because the mean of its divisors is an integer number (5032335).

Almost surely, 2^20118317 is an apocalyptic number.

It is an amenable number.

20118317 is a deficient number, since it is larger than the sum of its proper divisors (11023).

20118317 is an equidigital number, since it uses as much as digits as its factorization.

20118317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11022.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 20118317 is about 4485.3446913253. The cubic root of 20118317 is about 271.9759791720.

Adding to 20118317 its reverse (71381102), we get a palindrome (91499419).

The spelling of 20118317 in words is "twenty million, one hundred eighteen thousand, three hundred seventeen".