20869843846897 has 4 divisors (see below), whose sum is σ = 20872423882660. Its totient is φ = 20867263811136.

The previous prime is 20869843846847. The next prime is 20869843846903. The reversal of 20869843846897 is 79864834896802.

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 239998090816 + 20629845756081 = 489896^2 + 4542009^2 .

It is a cyclic number.

It is not a de Polignac number, because 20869843846897 - 2²⁷ = 20869709629169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20869843846897.

It is not an unprimeable number, because it can be changed into a prime (20869843846847) 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, 1290005748 + ... + 1290021925.

It is an arithmetic number, because the mean of its divisors is an integer number (5218105970665).

Almost surely, 2^{20869843846897} is an apocalyptic number.

It is an amenable number.

20869843846897 is a deficient number, since it is larger than the sum of its proper divisors (2580035763).

20869843846897 is an equidigital number, since it uses as much as digits as its factorization.

20869843846897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580035762.

The product of its (nonzero) digits is 8026324992, while the sum is 82.

The spelling of 20869843846897 in words is "twenty trillion, eight hundred sixty-nine billion, eight hundred forty-three million, eight hundred forty-six thousand, eight hundred ninety-seven".