20816005 has 16 divisors (see below), whose sum is σ = 28702080. Its totient is φ = 14196672.

The previous prime is 20815981. The next prime is 20816009. The reversal of 20816005 is 50061802.

It is a happy number.

It is not a de Polignac number, because 20816005 - 2¹¹ = 20813957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20816009) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5386 + ... + 8404.

It is an arithmetic number, because the mean of its divisors is an integer number (1793880).

Almost surely, 2^20816005 is an apocalyptic number.

It is an amenable number.

20816005 is a deficient number, since it is larger than the sum of its proper divisors (7886075).

20816005 is a wasteful number, since it uses less digits than its factorization.

20816005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3228.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 20816005 is about 4562.4560271854. The cubic root of 20816005 is about 275.0842937187.

Adding to 20816005 its reverse (50061802), we get a palindrome (70877807).

The spelling of 20816005 in words is "twenty million, eight hundred sixteen thousand, five".