20008065 has 64 divisors (see below), whose sum is σ = 42301440. Its totient is φ = 7818240.

The previous prime is 20008049. The next prime is 20008073. The reversal of 20008065 is 56080002.

It is a happy number.

It is not a de Polignac number, because 20008065 - 2⁴ = 20008049 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19126 + ... + 20144.

It is an arithmetic number, because the mean of its divisors is an integer number (660960).

Almost surely, 2^20008065 is an apocalyptic number.

It is an amenable number.

20008065 is an abundant number, since it is smaller than the sum of its proper divisors (22293375).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20008065 is a wasteful number, since it uses less digits than its factorization.

20008065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1062.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 20008065 is about 4473.0375585278. The cubic root of 20008065 is about 271.4782430530.

Adding to 20008065 its reverse (56080002), we get a palindrome (76088067).

The spelling of 20008065 in words is "twenty million, eight thousand, sixty-five".