20818208 has 24 divisors (see below), whose sum is σ = 41091120. Its totient is φ = 10382400.

The previous prime is 20818181. The next prime is 20818211. The reversal of 20818208 is 80281802.

It is an unprimeable number.

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, 19283 + ... + 20333.

It is an arithmetic number, because the mean of its divisors is an integer number (1712130).

Almost surely, 2^20818208 is an apocalyptic number.

It is an amenable number.

20818208 is a deficient number, since it is larger than the sum of its proper divisors (20272912).

20818208 is a wasteful number, since it uses less digits than its factorization.

20818208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1680 (or 1672 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 20818208 is about 4562.6974477824. The cubic root of 20818208 is about 275.0939976191.

The spelling of 20818208 in words is "twenty million, eight hundred eighteen thousand, two hundred eight".