8220520 has 128 divisors (see below), whose sum is σ = 24572160. Its totient is φ = 2396160.

The previous prime is 8220517. The next prime is 8220523. The reversal of 8220520 is 250228.

It is an interprime number because it is at equal distance from previous prime (8220517) and next prime (8220523).

It is not an unprimeable number, because it can be changed into a prime (8220523) 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, 52282 + ... + 52438.

It is an arithmetic number, because the mean of its divisors is an integer number (191970).

Almost surely, 2^8220520 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 8220520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12286080).

8220520 is an abundant number, since it is smaller than the sum of its proper divisors (16351640).

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

8220520 is a wasteful number, since it uses less digits than its factorization.

8220520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 8220520 is about 2867.1449213460. The cubic root of 8220520 is about 201.8210354915.

Adding to 8220520 its reverse (250228), we get a palindrome (8470748).

It can be divided in two parts, 82 and 20520, that added together give a palindrome (20602).

The spelling of 8220520 in words is "eight million, two hundred twenty thousand, five hundred twenty".