20096809 has 4 divisors (see below), whose sum is σ = 20640004. Its totient is φ = 19553616.

The previous prime is 20096807. The next prime is 20096819. The reversal of 20096809 is 90869002.

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 16581184 + 3515625 = 4072^2 + 1875^2 .

It is a cyclic number.

It is not a de Polignac number, because 20096809 - 2¹ = 20096807 is a prime.

It is a super-3 number, since 3×20096809³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20096801) 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, 271542 + ... + 271615.

It is an arithmetic number, because the mean of its divisors is an integer number (5160001).

Almost surely, 2^20096809 is an apocalyptic number.

It is an amenable number.

20096809 is a deficient number, since it is larger than the sum of its proper divisors (543195).

20096809 is an equidigital number, since it uses as much as digits as its factorization.

20096809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543194.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 20096809 is about 4482.9464641015. The cubic root of 20096809 is about 271.8790236600.

The spelling of 20096809 in words is "twenty million, ninety-six thousand, eight hundred nine".