20516886868535 has 8 divisors (see below), whose sum is σ = 24967028527776. Its totient is φ = 16182333304480.

The previous prime is 20516886868501. The next prime is 20516886868537. The reversal of 20516886868535 is 53586868861502.

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

It is not a de Polignac number, because 20516886868535 - 2²⁰ = 20516885819959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (71).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20516886868537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28897023404 + ... + 28897024113.

It is an arithmetic number, because the mean of its divisors is an integer number (3120878565972).

Almost surely, 2^{20516886868535} is an apocalyptic number.

20516886868535 is a deficient number, since it is larger than the sum of its proper divisors (4450141659241).

20516886868535 is an equidigital number, since it uses as much as digits as its factorization.

20516886868535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57794047593.

The product of its (nonzero) digits is 663552000, while the sum is 71.

The spelling of 20516886868535 in words is "twenty trillion, five hundred sixteen billion, eight hundred eighty-six million, eight hundred sixty-eight thousand, five hundred thirty-five".