20804105 has 8 divisors (see below), whose sum is σ = 28531392. Its totient is φ = 14265648.

The previous prime is 20804099. The next prime is 20804123. The reversal of 20804105 is 50140802.

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 20804105 - 2¹⁴ = 20787721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297167 + ... + 297236.

It is an arithmetic number, because the mean of its divisors is an integer number (3566424).

Almost surely, 2^20804105 is an apocalyptic number.

It is an amenable number.

20804105 is a deficient number, since it is larger than the sum of its proper divisors (7727287).

20804105 is an equidigital number, since it uses as much as digits as its factorization.

20804105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594415.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 20804105 is about 4561.1517185904. The cubic root of 20804105 is about 275.0318640764.

Adding to 20804105 its reverse (50140802), we get a palindrome (70944907).

The spelling of 20804105 in words is "twenty million, eight hundred four thousand, one hundred five".