20505000052517 has 4 divisors (see below), whose sum is σ = 20516737318176. Its totient is φ = 20493262786860.

The previous prime is 20505000052487. The next prime is 20505000052519. The reversal of 20505000052517 is 71525000050502.

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.

It is a cyclic number.

It is not a de Polignac number, because 20505000052517 - 2¹⁰ = 20505000051493 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 (20505000052519) 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, 5868630209 + ... + 5868633702.

It is an arithmetic number, because the mean of its divisors is an integer number (5129184329544).

Almost surely, 2^{20505000052517} is an apocalyptic number.

It is an amenable number.

20505000052517 is a deficient number, since it is larger than the sum of its proper divisors (11737265659).

20505000052517 is a wasteful number, since it uses less digits than its factorization.

20505000052517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11737265658.

The product of its (nonzero) digits is 17500, while the sum is 32.

The spelling of 20505000052517 in words is "twenty trillion, five hundred five billion, fifty-two thousand, five hundred seventeen".