8020009 has 4 divisors (see below), whose sum is σ = 8236804. Its totient is φ = 7803216.

The previous prime is 8020007. The next prime is 8020027. The reversal of 8020009 is 9000208.

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 3504384 + 4515625 = 1872^2 + 2125^2 .

It is a cyclic number.

It is not a de Polignac number, because 8020009 - 2¹ = 8020007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8020003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108342 + ... + 108415.

It is an arithmetic number, because the mean of its divisors is an integer number (2059201).

Almost surely, 2^8020009 is an apocalyptic number.

It is an amenable number.

8020009 is a deficient number, since it is larger than the sum of its proper divisors (216795).

8020009 is a wasteful number, since it uses less digits than its factorization.

8020009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216794.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 8020009 is about 2831.9620407061. The cubic root of 8020009 is about 200.1666028456.

The spelling of 8020009 in words is "eight million, twenty thousand, nine".