8020505 has 4 divisors (see below), whose sum is σ = 9624612. Its totient is φ = 6416400.

The previous prime is 8020499. The next prime is 8020517. The reversal of 8020505 is 5050208.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5234944 + 2785561 = 2288^2 + 1669^2 .

It is not a de Polignac number, because 8020505 - 2⁸ = 8020249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 802046 + ... + 802055.

It is an arithmetic number, because the mean of its divisors is an integer number (2406153).

Almost surely, 2^8020505 is an apocalyptic number.

It is an amenable number.

8020505 is a deficient number, since it is larger than the sum of its proper divisors (1604107).

8020505 is a wasteful number, since it uses less digits than its factorization.

8020505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1604106.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 8020505 is about 2832.0496111474. The cubic root of 8020505 is about 200.1707292162.

The spelling of 8020505 in words is "eight million, twenty thousand, five hundred five".