20217189 has 4 divisors (see below), whose sum is σ = 26956256. Its totient is φ = 13478124.

The previous prime is 20217173. The next prime is 20217193. The reversal of 20217189 is 98171202.

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 not a de Polignac number, because 20217189 - 2⁴ = 20217173 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20217289) 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, 3369529 + ... + 3369534.

It is an arithmetic number, because the mean of its divisors is an integer number (6739064).

Almost surely, 2^20217189 is an apocalyptic number.

It is an amenable number.

20217189 is a deficient number, since it is larger than the sum of its proper divisors (6739067).

20217189 is an equidigital number, since it uses as much as digits as its factorization.

20217189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6739066.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 20217189 is about 4496.3528553707. The cubic root of 20217189 is about 272.4207956549.

It can be divided in two parts, 202 and 17189, that added together give a triangular number (17391 = T₁₈₆).

The spelling of 20217189 in words is "twenty million, two hundred seventeen thousand, one hundred eighty-nine".