20366165 has 4 divisors (see below), whose sum is σ = 24439404. Its totient is φ = 16292928.

The previous prime is 20366161. The next prime is 20366179. The reversal of 20366165 is 56166302.

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 3118756 + 17247409 = 1766^2 + 4153^2 .

It is a cyclic number.

It is not a de Polignac number, because 20366165 - 2² = 20366161 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 (20366161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2036612 + ... + 2036621.

It is an arithmetic number, because the mean of its divisors is an integer number (6109851).

Almost surely, 2^20366165 is an apocalyptic number.

It is an amenable number.

20366165 is a deficient number, since it is larger than the sum of its proper divisors (4073239).

20366165 is an equidigital number, since it uses as much as digits as its factorization.

20366165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4073238.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 20366165 is about 4512.8887644169. Note that the first 3 decimals coincide. The cubic root of 20366165 is about 273.0882950010.

The spelling of 20366165 in words is "twenty million, three hundred sixty-six thousand, one hundred sixty-five".