20182165 has 4 divisors (see below), whose sum is σ = 24218604. Its totient is φ = 16145728.

The previous prime is 20182163. The next prime is 20182219. The reversal of 20182165 is 56128102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56128102 = 2 ⋅28064051.

It can be written as a sum of positive squares in 2 ways, for example, as 10284849 + 9897316 = 3207^2 + 3146^2 .

It is a cyclic number.

It is not a de Polignac number, because 20182165 - 2¹ = 20182163 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 (20182163) 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, 2018212 + ... + 2018221.

It is an arithmetic number, because the mean of its divisors is an integer number (6054651).

Almost surely, 2^20182165 is an apocalyptic number.

It is an amenable number.

20182165 is a deficient number, since it is larger than the sum of its proper divisors (4036439).

20182165 is an equidigital number, since it uses as much as digits as its factorization.

20182165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4036438.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 20182165 is about 4492.4564549921. The cubic root of 20182165 is about 272.2633919562.

The spelling of 20182165 in words is "twenty million, one hundred eighty-two thousand, one hundred sixty-five".