20844563039999 has 2 divisors, whose sum is σ = 20844563040000. Its totient is φ = 20844563039998.

The previous prime is 20844563039947. The next prime is 20844563040001. The reversal of 20844563039999 is 99993036544802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20844563039999 - 2¹² = 20844563035903 is a prime.

It is a Sophie Germain prime.

Together with 20844563040001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20844563030999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10422281519999 + 10422281520000.

It is an arithmetic number, because the mean of its divisors is an integer number (10422281520000).

Almost surely, 2^{20844563039999} is an apocalyptic number.

20844563039999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20844563039999 is an equidigital number, since it uses as much as digits as its factorization.

20844563039999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 453496320, while the sum is 71.

The spelling of 20844563039999 in words is "twenty trillion, eight hundred forty-four billion, five hundred sixty-three million, thirty-nine thousand, nine hundred ninety-nine".