208865220 has 96 divisors (see below), whose sum is σ = 599961600. Its totient is φ = 54274560.

The previous prime is 208865219. The next prime is 208865243. The reversal of 208865220 is 22568802.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 545149 + ... + 545531.

It is an arithmetic number, because the mean of its divisors is an integer number (6249600).

Almost surely, 2^208865220 is an apocalyptic number.

208865220 is a gapful number since it is divisible by the number (20) 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 208865220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299980800).

208865220 is an abundant number, since it is smaller than the sum of its proper divisors (391096380).

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

208865220 is a wasteful number, since it uses less digits than its factorization.

208865220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605 (or 603 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 208865220 is about 14452.1700792649. The cubic root of 208865220 is about 593.3196191194.

It can be divided in two parts, 20886 and 5220, that added together give a triangular number (26106 = T₂₂₈).

The spelling of 208865220 in words is "two hundred eight million, eight hundred sixty-five thousand, two hundred twenty".