20017113517 has 4 divisors (see below), whose sum is σ = 20030722816. Its totient is φ = 20003504220.

The previous prime is 20017113503. The next prime is 20017113533. The reversal of 20017113517 is 71531171002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71531171002 = 2 ⋅35765585501.

It is a cyclic number.

It is not a de Polignac number, because 20017113517 - 2¹⁵ = 20017080749 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 (20017113547) 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, 6802443 + ... + 6805384.

It is an arithmetic number, because the mean of its divisors is an integer number (5007680704).

Almost surely, 2^20017113517 is an apocalyptic number.

It is an amenable number.

20017113517 is a deficient number, since it is larger than the sum of its proper divisors (13609299).

20017113517 is a wasteful number, since it uses less digits than its factorization.

20017113517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13609298.

The product of its (nonzero) digits is 1470, while the sum is 28.

Adding to 20017113517 its reverse (71531171002), we get a palindrome (91548284519).

The spelling of 20017113517 in words is "twenty billion, seventeen million, one hundred thirteen thousand, five hundred seventeen".