20318805589 has 2 divisors, whose sum is σ = 20318805590. Its totient is φ = 20318805588.

The previous prime is 20318805583. The next prime is 20318805641. The reversal of 20318805589 is 98550881302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15052836100 + 5265969489 = 122690^2 + 72567^2 .

It is a cyclic number.

It is not a de Polignac number, because 20318805589 - 2³ = 20318805581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20318805581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10159402794 + 10159402795.

It is an arithmetic number, because the mean of its divisors is an integer number (10159402795).

Almost surely, 2^20318805589 is an apocalyptic number.

It is an amenable number.

20318805589 is a deficient number, since it is larger than the sum of its proper divisors (1).

20318805589 is an equidigital number, since it uses as much as digits as its factorization.

20318805589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 49.

The spelling of 20318805589 in words is "twenty billion, three hundred eighteen million, eight hundred five thousand, five hundred eighty-nine".