20440065 has 32 divisors (see below), whose sum is σ = 33914880. Its totient is φ = 10505664.

The previous prime is 20440039. The next prime is 20440109. The reversal of 20440065 is 56004402.

It is a happy number.

It is not a de Polignac number, because 20440065 - 2¹² = 20435969 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 55512 + ... + 55878.

It is an arithmetic number, because the mean of its divisors is an integer number (1059840).

Almost surely, 2^20440065 is an apocalyptic number.

It is an amenable number.

20440065 is a deficient number, since it is larger than the sum of its proper divisors (13474815).

20440065 is a wasteful number, since it uses less digits than its factorization.

20440065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 20440065 is about 4521.0690107540. The cubic root of 20440065 is about 273.4182027089.

Adding to 20440065 its reverse (56004402), we get a palindrome (76444467).

The spelling of 20440065 in words is "twenty million, four hundred forty thousand, sixty-five".