20808808 has 16 divisors (see below), whose sum is σ = 39657060. Its totient is φ = 10233600.

The previous prime is 20808803. The next prime is 20808829. The reversal of 20808808 is 80880802.

It can be written as a sum of positive squares in 2 ways, for example, as 19731364 + 1077444 = 4442^2 + 1038^2 .

It is not an unprimeable number, because it can be changed into a prime (20808803) 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 3 ways as a sum of consecutive naturals, for example, 20833 + ... + 21808.

Almost surely, 2^20808808 is an apocalyptic number.

It is an amenable number.

20808808 is a deficient number, since it is larger than the sum of its proper divisors (18848252).

20808808 is a wasteful number, since it uses less digits than its factorization.

20808808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42708 (or 42704 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 34.

The square root of 20808808 is about 4561.6672390695. The cubic root of 20808808 is about 275.0525871885.

The spelling of 20808808 in words is "twenty million, eight hundred eight thousand, eight hundred eight".