20168189 has 4 divisors (see below), whose sum is σ = 20452320. Its totient is φ = 19884060.

The previous prime is 20168173. The next prime is 20168191. The reversal of 20168189 is 98186102.

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 20168189 - 2⁴ = 20168173 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 (20168119) 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, 141959 + ... + 142100.

It is an arithmetic number, because the mean of its divisors is an integer number (5113080).

Almost surely, 2^20168189 is an apocalyptic number.

It is an amenable number.

20168189 is a deficient number, since it is larger than the sum of its proper divisors (284131).

20168189 is an equidigital number, since it uses as much as digits as its factorization.

20168189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284130.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 20168189 is about 4490.9006891714. The cubic root of 20168189 is about 272.2005306485.

The spelling of 20168189 in words is "twenty million, one hundred sixty-eight thousand, one hundred eighty-nine".