8320520 has 32 divisors (see below), whose sum is σ = 20162520. Its totient is φ = 3072000.

The previous prime is 8320519. The next prime is 8320541. The reversal of 8320520 is 250238.

It can be written as a sum of positive squares in 4 ways, for example, as 6646084 + 1674436 = 2578^2 + 1294^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 8320492 and 8320501.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7481 + ... + 8520.

Almost surely, 2^8320520 is an apocalyptic number.

It is an amenable number.

8320520 is an abundant number, since it is smaller than the sum of its proper divisors (11842000).

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

8320520 is a wasteful number, since it uses less digits than its factorization.

8320520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16025 (or 16021 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 8320520 is about 2884.5311577447. The cubic root of 8320520 is about 202.6361021736.

Adding to 8320520 its reverse (250238), we get a palindrome (8570758).

It can be divided in two parts, 83205 and 20, that multiplied together give a square (1664100 = 1290²).

The spelling of 8320520 in words is "eight million, three hundred twenty thousand, five hundred twenty".