20085506050891 has 4 divisors (see below), whose sum is σ = 20368400502384. Its totient is φ = 19802611599400.

The previous prime is 20085506050859. The next prime is 20085506050903. The reversal of 20085506050891 is 19805060558002.

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 20085506050891 - 2⁵ = 20085506050859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20085506057891) 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, 141447225640 + ... + 141447225781.

It is an arithmetic number, because the mean of its divisors is an integer number (5092100125596).

Almost surely, 2^{20085506050891} is an apocalyptic number.

20085506050891 is a deficient number, since it is larger than the sum of its proper divisors (282894451493).

20085506050891 is an equidigital number, since it uses as much as digits as its factorization.

20085506050891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282894451492.

The product of its (nonzero) digits is 864000, while the sum is 49.

The spelling of 20085506050891 in words is "twenty trillion, eighty-five billion, five hundred six million, fifty thousand, eight hundred ninety-one".