20089 has 2 divisors, whose sum is σ = 20090. Its totient is φ = 20088.

The previous prime is 20071. The next prime is 20101. The reversal of 20089 is 98002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13689 + 6400 = 117^2 + 80^2 .

It is a cyclic number.

It is not a de Polignac number, because 20089 - 2⁷ = 19961 is a prime.

20089 is a lucky number.

It is a plaindrome in base 7.

It is a nialpdrome in base 12.

It is not a weakly prime, because it can be changed into another prime (20029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10044 + 10045.

It is an arithmetic number, because the mean of its divisors is an integer number (10045).

2²⁰⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

20089 is a deficient number, since it is larger than the sum of its proper divisors (1).

20089 is an equidigital number, since it uses as much as digits as its factorization.

20089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 20089 is about 141.7356694696. The cubic root of 20089 is about 27.1843804498.

It can be divided in two parts, 200 and 89, that added together give a square (289 = 17²).

The spelling of 20089 in words is "twenty thousand, eighty-nine".