20688935696579 has 2 divisors, whose sum is σ = 20688935696580. Its totient is φ = 20688935696578.

The previous prime is 20688935696573. The next prime is 20688935696641. The reversal of 20688935696579 is 97569653988602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20688935696579 - 2²⁰ = 20688934648003 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20688935696497 and 20688935696506.

It is not a weakly prime, because it can be changed into another prime (20688935696573) 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, 10344467848289 + 10344467848290.

It is an arithmetic number, because the mean of its divisors is an integer number (10344467848290).

Almost surely, 2^{20688935696579} is an apocalyptic number.

20688935696579 is a deficient number, since it is larger than the sum of its proper divisors (1).

20688935696579 is an equidigital number, since it uses as much as digits as its factorization.

20688935696579 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10581580800, while the sum is 83.

The spelling of 20688935696579 in words is "twenty trillion, six hundred eighty-eight billion, nine hundred thirty-five million, six hundred ninety-six thousand, five hundred seventy-nine".