20804211 has 12 divisors (see below), whose sum is σ = 30094792. Its totient is φ = 13849056.

The previous prime is 20804159. The next prime is 20804257. The reversal of 20804211 is 11240802.

20804211 = 594² + 595² + ... + 647².

It is not a de Polignac number, because 20804211 - 2¹¹ = 20802163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20804611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7200 + ... + 9666.

Almost surely, 2^20804211 is an apocalyptic number.

20804211 is a deficient number, since it is larger than the sum of its proper divisors (9290581).

20804211 is a wasteful number, since it uses less digits than its factorization.

20804211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3410 (or 3407 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 20804211 is about 4561.1633384478. The cubic root of 20804211 is about 275.0323311850.

The spelling of 20804211 in words is "twenty million, eight hundred four thousand, two hundred eleven".