20816208 has 120 divisors (see below), whose sum is σ = 67549248. Its totient is φ = 5861376.

The previous prime is 20816207. The next prime is 20816231. The reversal of 20816208 is 80261802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20816207) 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 23 ways as a sum of consecutive naturals, for example, 107760 + ... + 107952.

Almost surely, 2^20816208 is an apocalyptic number.

20816208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20816208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33774624).

20816208 is an abundant number, since it is smaller than the sum of its proper divisors (46733040).

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

20816208 is a wasteful number, since it uses less digits than its factorization.

20816208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 312 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 20816208 is about 4562.4782739209. The cubic root of 20816208 is about 275.0851879333.

The spelling of 20816208 in words is "twenty million, eight hundred sixteen thousand, two hundred eight".