20559285289 has 4 divisors (see below), whose sum is σ = 20560556740. Its totient is φ = 20558013840.

The previous prime is 20559285269. The next prime is 20559285301. The reversal of 20559285289 is 98258295502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1773841689 + 18785443600 = 42117^2 + 137060^2 .

It is a cyclic number.

It is not a de Polignac number, because 20559285289 - 2¹⁹ = 20558761001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20559285269) 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 in 3 ways as a sum of consecutive naturals, for example, 611154 + ... + 643915.

It is an arithmetic number, because the mean of its divisors is an integer number (5140139185).

Almost surely, 2^20559285289 is an apocalyptic number.

It is an amenable number.

20559285289 is a deficient number, since it is larger than the sum of its proper divisors (1271451).

20559285289 is a wasteful number, since it uses less digits than its factorization.

20559285289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271450.

The product of its (nonzero) digits is 5184000, while the sum is 55.

The spelling of 20559285289 in words is "twenty billion, five hundred fifty-nine million, two hundred eighty-five thousand, two hundred eighty-nine".