20598191 has 4 divisors (see below), whose sum is σ = 20880432. Its totient is φ = 20315952.

The previous prime is 20598187. The next prime is 20598199. The reversal of 20598191 is 19189502.

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 20598191 - 2² = 20598187 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 (20598199) 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, 141011 + ... + 141156.

It is an arithmetic number, because the mean of its divisors is an integer number (5220108).

Almost surely, 2^20598191 is an apocalyptic number.

20598191 is a deficient number, since it is larger than the sum of its proper divisors (282241).

20598191 is an equidigital number, since it uses as much as digits as its factorization.

20598191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282240.

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

The square root of 20598191 is about 4538.5229976282. The cubic root of 20598191 is about 274.1214541389.

The spelling of 20598191 in words is "twenty million, five hundred ninety-eight thousand, one hundred ninety-one".