20206808 has 8 divisors (see below), whose sum is σ = 37887780. Its totient is φ = 10103400.

The previous prime is 20206807. The next prime is 20206817. The reversal of 20206808 is 80860202.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20206801) 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 as a sum of consecutive naturals, namely, 1262918 + ... + 1262933.

Almost surely, 2^20206808 is an apocalyptic number.

It is an amenable number.

20206808 is a deficient number, since it is larger than the sum of its proper divisors (17680972).

20206808 is a wasteful number, since it uses less digits than its factorization.

20206808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2525857 (or 2525853 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 20206808 is about 4495.1983271042. The cubic root of 20206808 is about 272.3741606776.

The spelling of 20206808 in words is "twenty million, two hundred six thousand, eight hundred eight".