8420820 has 48 divisors (see below), whose sum is σ = 23708160. Its totient is φ = 2233216.

The previous prime is 8420801. The next prime is 8420821. The reversal of 8420820 is 280248.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17341 + ... + 17819.

It is an arithmetic number, because the mean of its divisors is an integer number (493920).

Almost surely, 2^8420820 is an apocalyptic number.

It is an amenable number.

8420820 is an abundant number, since it is smaller than the sum of its proper divisors (15287340).

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

8420820 is a wasteful number, since it uses less digits than its factorization.

8420820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 8420820 is about 2901.8649176004. The cubic root of 8420820 is about 203.4470801952.

The spelling of 8420820 in words is "eight million, four hundred twenty thousand, eight hundred twenty".