20018517 has 8 divisors (see below), whose sum is σ = 27412896. Its totient is φ = 12984912.

The previous prime is 20018491. The next prime is 20018527. The reversal of 20018517 is 71581002.

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

It is not a de Polignac number, because 20018517 - 2¹⁴ = 20002133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20018527) 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, 90063 + ... + 90284.

It is an arithmetic number, because the mean of its divisors is an integer number (3426612).

Almost surely, 2^20018517 is an apocalyptic number.

It is an amenable number.

20018517 is a deficient number, since it is larger than the sum of its proper divisors (7394379).

20018517 is a wasteful number, since it uses less digits than its factorization.

20018517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180387.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 20018517 is about 4474.2057395699. The cubic root of 20018517 is about 271.5255072712.

Adding to 20018517 its reverse (71581002), we get a palindrome (91599519).

The spelling of 20018517 in words is "twenty million, eighteen thousand, five hundred seventeen".