20688759629 has 2 divisors, whose sum is σ = 20688759630. Its totient is φ = 20688759628.

The previous prime is 20688759563. The next prime is 20688759631. The reversal of 20688759629 is 92695788602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18366483529 + 2322276100 = 135523^2 + 48190^2 .

It is a cyclic number.

It is not a de Polignac number, because 20688759629 - 2⁸ = 20688759373 is a prime.

Together with 20688759631, 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 (20688759649) 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, 10344379814 + 10344379815.

It is an arithmetic number, because the mean of its divisors is an integer number (10344379815).

Almost surely, 2^20688759629 is an apocalyptic number.

It is an amenable number.

20688759629 is a deficient number, since it is larger than the sum of its proper divisors (1).

20688759629 is an equidigital number, since it uses as much as digits as its factorization.

20688759629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26127360, while the sum is 62.

The spelling of 20688759629 in words is "twenty billion, six hundred eighty-eight million, seven hundred fifty-nine thousand, six hundred twenty-nine".