8455220 has 12 divisors (see below), whose sum is σ = 17756004. Its totient is φ = 3382080.

The previous prime is 8455217. The next prime is 8455241. The reversal of 8455220 is 225548.

It can be written as a sum of positive squares in 2 ways, for example, as 1024144 + 7431076 = 1012^2 + 2726^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 8455220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211361 + ... + 211400.

It is an arithmetic number, because the mean of its divisors is an integer number (1479667).

Almost surely, 2^8455220 is an apocalyptic number.

It is an amenable number.

8455220 is an abundant number, since it is smaller than the sum of its proper divisors (9300784).

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

8455220 is a wasteful number, since it uses less digits than its factorization.

8455220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422770 (or 422768 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 8455220 is about 2907.7860994234. The cubic root of 8455220 is about 203.7237385702.

The spelling of 8455220 in words is "eight million, four hundred fifty-five thousand, two hundred twenty".