20816006 has 16 divisors (see below), whose sum is σ = 32081280. Its totient is φ = 10126080.

The previous prime is 20815981. The next prime is 20816009. The reversal of 20816006 is 60061802.

It is a super-2 number, since 2×20816006² = 866612211584072, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 10955 + ... + 12713.

It is an arithmetic number, because the mean of its divisors is an integer number (2005080).

Almost surely, 2^20816006 is an apocalyptic number.

20816006 is a deficient number, since it is larger than the sum of its proper divisors (11265274).

20816006 is a wasteful number, since it uses less digits than its factorization.

20816006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1919.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 20816006 is about 4562.4561367755. The cubic root of 20816006 is about 275.0842981237.

Adding to 20816006 its reverse (60061802), we get a palindrome (80877808).

The spelling of 20816006 in words is "twenty million, eight hundred sixteen thousand, six".