20321065 has 4 divisors (see below), whose sum is σ = 24385284. Its totient is φ = 16256848.

The previous prime is 20321057. The next prime is 20321071. The reversal of 20321065 is 56012302.

It is a happy number.

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 2096704 + 18224361 = 1448^2 + 4269^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321065 - 2³ = 20321057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2032102 + ... + 2032111.

It is an arithmetic number, because the mean of its divisors is an integer number (6096321).

Almost surely, 2^20321065 is an apocalyptic number.

It is an amenable number.

20321065 is a deficient number, since it is larger than the sum of its proper divisors (4064219).

20321065 is an equidigital number, since it uses as much as digits as its factorization.

20321065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4064218.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 20321065 is about 4507.8891956214. The cubic root of 20321065 is about 272.8865652432.

Adding to 20321065 its reverse (56012302), we get a palindrome (76333367).

The spelling of 20321065 in words is "twenty million, three hundred twenty-one thousand, sixty-five".