20894170850197 has 4 divisors (see below), whose sum is σ = 22123239723756. Its totient is φ = 19665101976640.

The previous prime is 20894170850191. The next prime is 20894170850327. The reversal of 20894170850197 is 79105807149802.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8768669905636 + 12125500944561 = 2961194^2 + 3482169^2 .

It is a cyclic number.

It is not a de Polignac number, because 20894170850197 - 2¹¹ = 20894170848149 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 (20894170850191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614534436754 + ... + 614534436787.

It is an arithmetic number, because the mean of its divisors is an integer number (5530809930939).

Almost surely, 2^{20894170850197} is an apocalyptic number.

It is an amenable number.

20894170850197 is a deficient number, since it is larger than the sum of its proper divisors (1229068873559).

20894170850197 is a wasteful number, since it uses less digits than its factorization.

20894170850197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1229068873558.

The product of its (nonzero) digits is 10160640, while the sum is 61.

Adding to 20894170850197 its reverse (79105807149802), we get a palindrome (99999977999999).

The spelling of 20894170850197 in words is "twenty trillion, eight hundred ninety-four billion, one hundred seventy million, eight hundred fifty thousand, one hundred ninety-seven".