20466081089 has 2 divisors, whose sum is σ = 20466081090. Its totient is φ = 20466081088.

The previous prime is 20466081071. The next prime is 20466081127. The reversal of 20466081089 is 98018066402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11920927489 + 8545153600 = 109183^2 + 92440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20466081089 is a prime.

It is not a weakly prime, because it can be changed into another prime (20466081019) 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 as a sum of consecutive naturals, namely, 10233040544 + 10233040545.

It is an arithmetic number, because the mean of its divisors is an integer number (10233040545).

Almost surely, 2^20466081089 is an apocalyptic number.

It is an amenable number.

20466081089 is a deficient number, since it is larger than the sum of its proper divisors (1).

20466081089 is an equidigital number, since it uses as much as digits as its factorization.

20466081089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 44.

The spelling of 20466081089 in words is "twenty billion, four hundred sixty-six million, eighty-one thousand, eighty-nine".