20517425717503 has 16 divisors (see below), whose sum is σ = 24104882188800. Its totient is φ = 17217067373280.

The previous prime is 20517425717501. The next prime is 20517425717527. The reversal of 20517425717503 is 30571752471502.

It is a cyclic number.

It is not a de Polignac number, because 20517425717503 - 2¹ = 20517425717501 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 (20517425717501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5653158 + ... + 8543596.

It is an arithmetic number, because the mean of its divisors is an integer number (1506555136800).

Almost surely, 2^{20517425717503} is an apocalyptic number.

20517425717503 is a deficient number, since it is larger than the sum of its proper divisors (3587456471297).

20517425717503 is a wasteful number, since it uses less digits than its factorization.

20517425717503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2940102.

The product of its (nonzero) digits is 2058000, while the sum is 49.

The spelling of 20517425717503 in words is "twenty trillion, five hundred seventeen billion, four hundred twenty-five million, seven hundred seventeen thousand, five hundred three".