20144165 has 4 divisors (see below), whose sum is σ = 24173004. Its totient is φ = 16115328.

The previous prime is 20144143. The next prime is 20144209. The reversal of 20144165 is 56144102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15888196 + 4255969 = 3986^2 + 2063^2 .

It is a cyclic number.

It is not a de Polignac number, because 20144165 - 2⁶ = 20144101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20144165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2014412 + ... + 2014421.

It is an arithmetic number, because the mean of its divisors is an integer number (6043251).

Almost surely, 2^20144165 is an apocalyptic number.

It is an amenable number.

20144165 is a deficient number, since it is larger than the sum of its proper divisors (4028839).

20144165 is an equidigital number, since it uses as much as digits as its factorization.

20144165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028838.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 20144165 is about 4488.2251503239. The cubic root of 20144165 is about 272.0924075082.

Adding to 20144165 its reverse (56144102), we get a palindrome (76288267).

The spelling of 20144165 in words is "twenty million, one hundred forty-four thousand, one hundred sixty-five".