20017705999 has 2 divisors, whose sum is σ = 20017706000. Its totient is φ = 20017705998.

The previous prime is 20017705993. The next prime is 20017706039. The reversal of 20017705999 is 99950771002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20017705999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20017705993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10008852999 + 10008853000.

It is an arithmetic number, because the mean of its divisors is an integer number (10008853000).

Almost surely, 2^20017705999 is an apocalyptic number.

20017705999 is a deficient number, since it is larger than the sum of its proper divisors (1).

20017705999 is an equidigital number, since it uses as much as digits as its factorization.

20017705999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 357210, while the sum is 49.

The spelling of 20017705999 in words is "twenty billion, seventeen million, seven hundred five thousand, nine hundred ninety-nine".