20876970085 has 4 divisors (see below), whose sum is σ = 25052364108. Its totient is φ = 16701576064.

The previous prime is 20876970067. The next prime is 20876970131. The reversal of 20876970085 is 58007967802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58007967802 = 2 ⋅29003983901.

It can be written as a sum of positive squares in 2 ways, for example, as 15970387876 + 4906582209 = 126374^2 + 70047^2 .

It is a cyclic number.

It is not a de Polignac number, because 20876970085 - 2⁵ = 20876970053 is a prime.

It is a Duffinian number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2087697004 + ... + 2087697013.

It is an arithmetic number, because the mean of its divisors is an integer number (6263091027).

Almost surely, 2^20876970085 is an apocalyptic number.

It is an amenable number.

20876970085 is a deficient number, since it is larger than the sum of its proper divisors (4175394023).

20876970085 is an equidigital number, since it uses as much as digits as its factorization.

20876970085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4175394022.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 20876970085 in words is "twenty billion, eight hundred seventy-six million, nine hundred seventy thousand, eighty-five".