20899208 has 64 divisors (see below), whose sum is σ = 45342720. Its totient is φ = 8942400.

The previous prime is 20899201. The next prime is 20899211. The reversal of 20899208 is 80299802.

It is not an unprimeable number, because it can be changed into a prime (20899201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128135 + ... + 128297.

It is an arithmetic number, because the mean of its divisors is an integer number (708480).

Almost surely, 2^20899208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20899208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22671360).

20899208 is an abundant number, since it is smaller than the sum of its proper divisors (24443512).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20899208 is a wasteful number, since it uses less digits than its factorization.

20899208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 254 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 20899208 is about 4571.5651586738. The cubic root of 20899208 is about 275.4503167423.

The spelling of 20899208 in words is "twenty million, eight hundred ninety-nine thousand, two hundred eight".