20208686689 has 8 divisors (see below), whose sum is σ = 20977125120. Its totient is φ = 19447532400.

The previous prime is 20208686671. The next prime is 20208686753. The reversal of 20208686689 is 98668680202.

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

It is a cyclic number.

It is not a de Polignac number, because 20208686689 - 2²⁹ = 19671815777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20208686609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1815382 + ... + 1826479.

It is an arithmetic number, because the mean of its divisors is an integer number (2622140640).

Almost surely, 2^20208686689 is an apocalyptic number.

It is an amenable number.

20208686689 is a deficient number, since it is larger than the sum of its proper divisors (768438431).

20208686689 is a wasteful number, since it uses less digits than its factorization.

20208686689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642071.

The product of its (nonzero) digits is 3981312, while the sum is 55.

The spelling of 20208686689 in words is "twenty billion, two hundred eight million, six hundred eighty-six thousand, six hundred eighty-nine".