20204805 has 8 divisors (see below), whose sum is σ = 32327712. Its totient is φ = 10775888.

The previous prime is 20204761. The next prime is 20204813. The reversal of 20204805 is 50840202.

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 20204805 - 2⁹ = 20204293 is a prime.

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, 673479 + ... + 673508.

It is an arithmetic number, because the mean of its divisors is an integer number (4040964).

Almost surely, 2^20204805 is an apocalyptic number.

It is an amenable number.

20204805 is a deficient number, since it is larger than the sum of its proper divisors (12122907).

20204805 is a wasteful number, since it uses less digits than its factorization.

20204805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346995.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 20204805 is about 4494.9755282982. The cubic root of 20204805 is about 272.3651606833.

The spelling of 20204805 in words is "twenty million, two hundred four thousand, eight hundred five".