8520420 has 24 divisors (see below), whose sum is σ = 23857344. Its totient is φ = 2272096.

The previous prime is 8520409. The next prime is 8520427. The reversal of 8520420 is 240258.

It is not an unprimeable number, because it can be changed into a prime (8520427) 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 7 ways as a sum of consecutive naturals, for example, 70944 + ... + 71063.

It is an arithmetic number, because the mean of its divisors is an integer number (994056).

Almost surely, 2^8520420 is an apocalyptic number.

It is an amenable number.

8520420 is an abundant number, since it is smaller than the sum of its proper divisors (15336924).

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

8520420 is a wasteful number, since it uses less digits than its factorization.

8520420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142019 (or 142017 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 8520420 is about 2918.9758477932. The cubic root of 8520420 is about 204.2460506700.

Adding to 8520420 its reverse (240258), we get a palindrome (8760678).

The spelling of 8520420 in words is "eight million, five hundred twenty thousand, four hundred twenty".