20009589 has 4 divisors (see below), whose sum is σ = 26679456. Its totient is φ = 13339724.

The previous prime is 20009581. The next prime is 20009593. The reversal of 20009589 is 98590002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20009589 - 2³ = 20009581 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 (20009581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3334929 + ... + 3334934.

It is an arithmetic number, because the mean of its divisors is an integer number (6669864).

Almost surely, 2^20009589 is an apocalyptic number.

It is an amenable number.

20009589 is a deficient number, since it is larger than the sum of its proper divisors (6669867).

20009589 is an equidigital number, since it uses as much as digits as its factorization.

20009589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6669866.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 20009589 is about 4473.2079093197. The cubic root of 20009589 is about 271.4851356459.

The spelling of 20009589 in words is "twenty million, nine thousand, five hundred eighty-nine".