20128559 has 8 divisors (see below), whose sum is σ = 22107600. Its totient is φ = 18174400.

The previous prime is 20128553. The next prime is 20128573. The reversal of 20128559 is 95582102.

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 20128559 - 2¹⁶ = 20063023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20128553) 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, 4502 + ... + 7779.

It is an arithmetic number, because the mean of its divisors is an integer number (2763450).

Almost surely, 2^20128559 is an apocalyptic number.

20128559 is a deficient number, since it is larger than the sum of its proper divisors (1979041).

20128559 is a wasteful number, since it uses less digits than its factorization.

20128559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12441.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 20128559 is about 4486.4862643276. The cubic root of 20128559 is about 272.0221246060.

The spelling of 20128559 in words is "twenty million, one hundred twenty-eight thousand, five hundred fifty-nine".