20632165 has 4 divisors (see below), whose sum is σ = 24758604. Its totient is φ = 16505728.

The previous prime is 20632163. The next prime is 20632177. The reversal of 20632165 is 56123602.

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 7214596 + 13417569 = 2686^2 + 3663^2 .

It is a cyclic number.

It is not a de Polignac number, because 20632165 - 2¹ = 20632163 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 (20632163) 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, 2063212 + ... + 2063221.

It is an arithmetic number, because the mean of its divisors is an integer number (6189651).

Almost surely, 2^20632165 is an apocalyptic number.

It is an amenable number.

20632165 is a deficient number, since it is larger than the sum of its proper divisors (4126439).

20632165 is an equidigital number, since it uses as much as digits as its factorization.

20632165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4126438.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 20632165 is about 4542.2643031862. The cubic root of 20632165 is about 274.2720804209.

Adding to 20632165 its reverse (56123602), we get a palindrome (76755767).

The spelling of 20632165 in words is "twenty million, six hundred thirty-two thousand, one hundred sixty-five".