20646192809089 has 2 divisors, whose sum is σ = 20646192809090. Its totient is φ = 20646192809088.

The previous prime is 20646192809041. The next prime is 20646192809161. The reversal of 20646192809089 is 98090829164602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14930186881600 + 5716005927489 = 3863960^2 + 2390817^2 .

It is a cyclic number.

It is not a de Polignac number, because 20646192809089 - 2²⁹ = 20645655938177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20646192809089.

It is not a weakly prime, because it can be changed into another prime (20646192809989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10323096404544 + 10323096404545.

It is an arithmetic number, because the mean of its divisors is an integer number (10323096404545).

Almost surely, 2^{20646192809089} is an apocalyptic number.

It is an amenable number.

20646192809089 is a deficient number, since it is larger than the sum of its proper divisors (1).

20646192809089 is an equidigital number, since it uses as much as digits as its factorization.

20646192809089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26873856, while the sum is 64.

The spelling of 20646192809089 in words is "twenty trillion, six hundred forty-six billion, one hundred ninety-two million, eight hundred nine thousand, eighty-nine".