20808808606447 has 2 divisors, whose sum is σ = 20808808606448. Its totient is φ = 20808808606446.

The previous prime is 20808808606277. The next prime is 20808808606501. The reversal of 20808808606447 is 74460680880802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20808808606447 - 2¹⁹ = 20808808082159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20808808606247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10404404303223 + 10404404303224.

It is an arithmetic number, because the mean of its divisors is an integer number (10404404303224).

Almost surely, 2^{20808808606447} is an apocalyptic number.

20808808606447 is a deficient number, since it is larger than the sum of its proper divisors (1).

20808808606447 is an equidigital number, since it uses as much as digits as its factorization.

20808808606447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33030144, while the sum is 61.

The spelling of 20808808606447 in words is "twenty trillion, eight hundred eight billion, eight hundred eight million, six hundred six thousand, four hundred forty-seven".