20796809 has 8 divisors (see below), whose sum is σ = 22913280. Its totient is φ = 18718000.

The previous prime is 20796781. The next prime is 20796817. The reversal of 20796809 is 90869702.

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 20796809 - 2¹⁶ = 20731273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20796869) by changing a digit.

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, 8249 + ... + 10470.

It is an arithmetic number, because the mean of its divisors is an integer number (2864160).

Almost surely, 2^20796809 is an apocalyptic number.

It is an amenable number.

20796809 is a deficient number, since it is larger than the sum of its proper divisors (2116471).

20796809 is a wasteful number, since it uses less digits than its factorization.

20796809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18831.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 20796809 is about 4560.3518504607. The cubic root of 20796809 is about 274.9997090906. Note that the first 3 decimals are identical.

It can be divided in two parts, 2079 and 6809, that added together give a palindrome (8888).

The spelling of 20796809 in words is "twenty million, seven hundred ninety-six thousand, eight hundred nine".