20115317 has 8 divisors (see below), whose sum is σ = 21119616. Its totient is φ = 19121872.

The previous prime is 20115307. The next prime is 20115323. The reversal of 20115317 is 71351102.

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 20115317 - 2⁶ = 20115253 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 (20115307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1223 + ... + 6459.

It is an arithmetic number, because the mean of its divisors is an integer number (2639952).

Almost surely, 2^20115317 is an apocalyptic number.

It is an amenable number.

20115317 is a deficient number, since it is larger than the sum of its proper divisors (1004299).

20115317 is a wasteful number, since it uses less digits than its factorization.

20115317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5427.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 20115317 is about 4485.0102563985. The cubic root of 20115317 is about 271.9624596763.

Adding to 20115317 its reverse (71351102), we get a palindrome (91466419).

The spelling of 20115317 in words is "twenty million, one hundred fifteen thousand, three hundred seventeen".