20684081804807 has 4 divisors (see below), whose sum is σ = 20738657218920. Its totient is φ = 20629506390696.

The previous prime is 20684081804777. The next prime is 20684081804809. The reversal of 20684081804807 is 70840818048602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20684081804807 - 2¹⁶ = 20684081739271 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 (20684081804809) 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, 27287706488 + ... + 27287707245.

It is an arithmetic number, because the mean of its divisors is an integer number (5184664304730).

Almost surely, 2^{20684081804807} is an apocalyptic number.

20684081804807 is a deficient number, since it is larger than the sum of its proper divisors (54575414113).

20684081804807 is an equidigital number, since it uses as much as digits as its factorization.

20684081804807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54575414112.

The product of its (nonzero) digits is 5505024, while the sum is 56.

The spelling of 20684081804807 in words is "twenty trillion, six hundred eighty-four billion, eighty-one million, eight hundred four thousand, eight hundred seven".