8420220 has 96 divisors (see below), whose sum is σ = 27095040. Its totient is φ = 2168640.

The previous prime is 8420207. The next prime is 8420221. The reversal of 8420220 is 220248.

8420220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 8420193 and 8420202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16489 + ... + 16991.

It is an arithmetic number, because the mean of its divisors is an integer number (282240).

Almost surely, 2^8420220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8420220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13547520).

8420220 is an abundant number, since it is smaller than the sum of its proper divisors (18674820).

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

8420220 is a wasteful number, since it uses less digits than its factorization.

8420220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 544 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 8420220 is about 2901.7615339652. The cubic root of 8420220 is about 203.4422480788.

Adding to 8420220 its reverse (220248), we get a palindrome (8640468).

The spelling of 8420220 in words is "eight million, four hundred twenty thousand, two hundred twenty".