20244163587209 has 2 divisors, whose sum is σ = 20244163587210. Its totient is φ = 20244163587208.

The previous prime is 20244163587203. The next prime is 20244163587211. The reversal of 20244163587209 is 90278536144202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17340728208400 + 2903435378809 = 4164220^2 + 1703947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20244163587209 is a prime.

Together with 20244163587211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20244163587203) by changing a digit.

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 as a sum of consecutive naturals, namely, 10122081793604 + 10122081793605.

It is an arithmetic number, because the mean of its divisors is an integer number (10122081793605).

It is a 1-persistent number, because it is pandigital, but 2⋅20244163587209 = 40488327174418 is not.

Almost surely, 2^{20244163587209} is an apocalyptic number.

It is an amenable number.

20244163587209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20244163587209 is an equidigital number, since it uses as much as digits as its factorization.

20244163587209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 53.

The spelling of 20244163587209 in words is "twenty trillion, two hundred forty-four billion, one hundred sixty-three million, five hundred eighty-seven thousand, two hundred nine".