20500516065 has 16 divisors (see below), whose sum is σ = 32928461568. Its totient is φ = 10891063296.

The previous prime is 20500515989. The next prime is 20500516079. The reversal of 20500516065 is 56061500502.

It is not a de Polignac number, because 20500516065 - 2¹⁰ = 20500515041 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2655097 + ... + 2662806.

It is an arithmetic number, because the mean of its divisors is an integer number (2058028848).

Almost surely, 2^20500516065 is an apocalyptic number.

It is an amenable number.

20500516065 is a deficient number, since it is larger than the sum of its proper divisors (12427945503).

20500516065 is a wasteful number, since it uses less digits than its factorization.

20500516065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5318168.

The product of its (nonzero) digits is 9000, while the sum is 30.

The spelling of 20500516065 in words is "twenty billion, five hundred million, five hundred sixteen thousand, sixty-five".