20502018517 has 8 divisors (see below), whose sum is σ = 20696475800. Its totient is φ = 20307677184.

The previous prime is 20502018497. The next prime is 20502018521. The reversal of 20502018517 is 71581020502.

It can be written as a sum of positive squares in 4 ways, for example, as 14676561 + 20487341956 = 3831^2 + 143134^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20502018517 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 (20502018527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349609 + ... + 404017.

It is an arithmetic number, because the mean of its divisors is an integer number (2587059475).

Almost surely, 2^20502018517 is an apocalyptic number.

It is an amenable number.

20502018517 is a deficient number, since it is larger than the sum of its proper divisors (194457283).

20502018517 is a wasteful number, since it uses less digits than its factorization.

20502018517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57975.

The product of its (nonzero) digits is 5600, while the sum is 31.

The spelling of 20502018517 in words is "twenty billion, five hundred two million, eighteen thousand, five hundred seventeen".