8020805509 has 8 divisors (see below), whose sum is σ = 8173663992. Its totient is φ = 7868003520.

The previous prime is 8020805497. The next prime is 8020805519. The reversal of 8020805509 is 9055080208.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3245580900 + 4775224609 = 56970^2 + 69103^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8020805509 - 2⁵ = 8020805477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8020805519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371799 + ... + 392779.

It is an arithmetic number, because the mean of its divisors is an integer number (1021707999).

Almost surely, 2^8020805509 is an apocalyptic number.

It is an amenable number.

8020805509 is a deficient number, since it is larger than the sum of its proper divisors (152858483).

8020805509 is a wasteful number, since it uses less digits than its factorization.

8020805509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28247.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 8020805509 is about 89558.9499101011. The cubic root of 8020805509 is about 2001.7322915664.

The spelling of 8020805509 in words is "eight billion, twenty million, eight hundred five thousand, five hundred nine".