20808908589 has 16 divisors (see below), whose sum is σ = 32228631680. Its totient is φ = 11695872960.

The previous prime is 20808908573. The next prime is 20808908621. The reversal of 20808908589 is 98580980802.

It is not a de Polignac number, because 20808908589 - 2⁴ = 20808908573 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20808908489) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8120854 + ... + 8123415.

It is an arithmetic number, because the mean of its divisors is an integer number (2014289480).

Almost surely, 2^20808908589 is an apocalyptic number.

It is an amenable number.

20808908589 is a deficient number, since it is larger than the sum of its proper divisors (11419723091).

20808908589 is a wasteful number, since it uses less digits than its factorization.

20808908589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16244340.

The product of its (nonzero) digits is 3317760, while the sum is 57.

The spelling of 20808908589 in words is "twenty billion, eight hundred eight million, nine hundred eight thousand, five hundred eighty-nine".