208215220 has 48 divisors (see below), whose sum is σ = 462422016. Its totient is φ = 78624000.

The previous prime is 208215197. The next prime is 208215223. The reversal of 208215220 is 22512802.

It is a junction number, because it is equal to n+sod(n) for n = 208215191 and 208215200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208215223) 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, 21325 + ... + 29515.

It is an arithmetic number, because the mean of its divisors is an integer number (9633792).

Almost surely, 2^208215220 is an apocalyptic number.

208215220 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 208215220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231211008).

208215220 is an abundant number, since it is smaller than the sum of its proper divisors (254206796).

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

208215220 is a wasteful number, since it uses less digits than its factorization.

208215220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8272 (or 8270 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 208215220 is about 14429.6645837663. The cubic root of 208215220 is about 592.7034984967.

The spelling of 208215220 in words is "two hundred eight million, two hundred fifteen thousand, two hundred twenty".