20104805 has 8 divisors (see below), whose sum is σ = 27572352. Its totient is φ = 13786128.

The previous prime is 20104787. The next prime is 20104811. The reversal of 20104805 is 50840102.

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 20104805 - 2⁶ = 20104741 is a prime.

It is a Duffinian number.

It is a congruent 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, 287177 + ... + 287246.

It is an arithmetic number, because the mean of its divisors is an integer number (3446544).

Almost surely, 2^20104805 is an apocalyptic number.

It is an amenable number.

20104805 is a deficient number, since it is larger than the sum of its proper divisors (7467547).

20104805 is an equidigital number, since it uses as much as digits as its factorization.

20104805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574435.

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

The square root of 20104805 is about 4483.8381995786. The cubic root of 20104805 is about 271.9150767538.

Adding to 20104805 its reverse (50840102), we get a palindrome (70944907).

The spelling of 20104805 in words is "twenty million, one hundred four thousand, eight hundred five".