20890209710085 has 16 divisors (see below), whose sum is σ = 34877567516544. Its totient is φ = 10657034518592.

The previous prime is 20890209710047. The next prime is 20890209710189. The reversal of 20890209710085 is 58001790209802.

It is a cyclic number.

It is not a de Polignac number, because 20890209710085 - 2²⁶ = 20890142601221 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 30275665902 + ... + 30275666591.

It is an arithmetic number, because the mean of its divisors is an integer number (2179847969784).

Almost surely, 2^{20890209710085} is an apocalyptic number.

It is an amenable number.

20890209710085 is a deficient number, since it is larger than the sum of its proper divisors (13987357806459).

20890209710085 is a wasteful number, since it uses less digits than its factorization.

20890209710085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60551332524.

The product of its (nonzero) digits is 725760, while the sum is 51.

Adding to 20890209710085 its reverse (58001790209802), we get a palindrome (78891999919887).

The spelling of 20890209710085 in words is "twenty trillion, eight hundred ninety billion, two hundred nine million, seven hundred ten thousand, eighty-five".