8520820 has 72 divisors (see below), whose sum is σ = 22522752. Its totient is φ = 2650560.

The previous prime is 8520803. The next prime is 8520821. The reversal of 8520820 is 280258.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8520821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16689 + ... + 17191.

It is an arithmetic number, because the mean of its divisors is an integer number (312816).

Almost surely, 2^8520820 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 8520820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11261376).

8520820 is an abundant number, since it is smaller than the sum of its proper divisors (14001932).

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

8520820 is a wasteful number, since it uses less digits than its factorization.

8520820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 8520820 is about 2919.0443641713. The cubic root of 8520820 is about 204.2492468013.

The spelling of 8520820 in words is "eight million, five hundred twenty thousand, eight hundred twenty".