20688668589 has 8 divisors (see below), whose sum is σ = 27585758080. Its totient is φ = 13792012416.

The previous prime is 20688668569. The next prime is 20688668621. The reversal of 20688668589 is 98586688602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20688668589 - 2¹¹ = 20688666541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20688668549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27357 + ... + 205245.

It is an arithmetic number, because the mean of its divisors is an integer number (3448219760).

Almost surely, 2^20688668589 is an apocalyptic number.

It is an amenable number.

20688668589 is a deficient number, since it is larger than the sum of its proper divisors (6897089491).

20688668589 is a wasteful number, since it uses less digits than its factorization.

20688668589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216659.

The product of its (nonzero) digits is 79626240, while the sum is 66.

The spelling of 20688668589 in words is "twenty billion, six hundred eighty-eight million, six hundred sixty-eight thousand, five hundred eighty-nine".