20589191 has 4 divisors (see below), whose sum is σ = 23530512. Its totient is φ = 17647872.

The previous prime is 20589187. The next prime is 20589199. The reversal of 20589191 is 19198502.

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

It is a cyclic number.

It is not a de Polignac number, because 20589191 - 2² = 20589187 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 (20589199) 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, 1470650 + ... + 1470663.

It is an arithmetic number, because the mean of its divisors is an integer number (5882628).

Almost surely, 2^20589191 is an apocalyptic number.

20589191 is a deficient number, since it is larger than the sum of its proper divisors (2941321).

20589191 is an equidigital number, since it uses as much as digits as its factorization.

20589191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2941320.

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 20589191 is about 4537.5313773020. The cubic root of 20589191 is about 274.0815242167.

The spelling of 20589191 in words is "twenty million, five hundred eighty-nine thousand, one hundred ninety-one".