8500220 has 24 divisors (see below), whose sum is σ = 18790800. Its totient is φ = 3220992.

The previous prime is 8500213. The next prime is 8500229. The reversal of 8500220 is 220058.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8500229) 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 7 ways as a sum of consecutive naturals, for example, 10805 + ... + 11564.

It is an arithmetic number, because the mean of its divisors is an integer number (782950).

Almost surely, 2^8500220 is an apocalyptic number.

It is an amenable number.

8500220 is an abundant number, since it is smaller than the sum of its proper divisors (10290580).

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

8500220 is a wasteful number, since it uses less digits than its factorization.

8500220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22397 (or 22395 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 8500220 is about 2915.5136768673. The cubic root of 8500220 is about 204.0845157946.

Adding to 8500220 its reverse (220058), we get a palindrome (8720278).

The spelling of 8500220 in words is "eight million, five hundred thousand, two hundred twenty".