20017003518517 has 8 divisors (see below), whose sum is σ = 20029377013056. Its totient is φ = 20004630465792.

The previous prime is 20017003518509. The next prime is 20017003518539. The reversal of 20017003518517 is 71581530071002.

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 20017003518517 - 2³ = 20017003518509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20017003518517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20017003518817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177750933 + ... + 177863509.

It is an arithmetic number, because the mean of its divisors is an integer number (2503672126632).

Almost surely, 2^{20017003518517} is an apocalyptic number.

It is an amenable number.

20017003518517 is a deficient number, since it is larger than the sum of its proper divisors (12373494539).

20017003518517 is a wasteful number, since it uses less digits than its factorization.

20017003518517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220907.

The product of its (nonzero) digits is 58800, while the sum is 40.

Adding to 20017003518517 its reverse (71581530071002), we get a palindrome (91598533589519).

The spelling of 20017003518517 in words is "twenty trillion, seventeen billion, three million, five hundred eighteen thousand, five hundred seventeen".