20001589 has 8 divisors (see below), whose sum is σ = 20401920. Its totient is φ = 19605216.

The previous prime is 20001557. The next prime is 20001613. The reversal of 20001589 is 98510002.

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 20001589 - 2⁵ = 20001557 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 (20001389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10492 + ... + 12250.

It is an arithmetic number, because the mean of its divisors is an integer number (2550240).

Almost surely, 2^20001589 is an apocalyptic number.

It is an amenable number.

20001589 is a deficient number, since it is larger than the sum of its proper divisors (400331).

20001589 is a wasteful number, since it uses less digits than its factorization.

20001589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 20001589 is about 4472.3136070718. The cubic root of 20001589 is about 271.4489501518.

The spelling of 20001589 in words is "twenty million, one thousand, five hundred eighty-nine".