20800205 has 4 divisors (see below), whose sum is σ = 24960252. Its totient is φ = 16640160.

The previous prime is 20800201. The next prime is 20800229. The reversal of 20800205 is 50200802.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50200802 = 2 ⋅25100401.

It can be written as a sum of positive squares in 2 ways, for example, as 5410276 + 15389929 = 2326^2 + 3923^2 .

It is not a de Polignac number, because 20800205 - 2² = 20800201 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20800201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2080016 + ... + 2080025.

It is an arithmetic number, because the mean of its divisors is an integer number (6240063).

Almost surely, 2^20800205 is an apocalyptic number.

It is an amenable number.

20800205 is a deficient number, since it is larger than the sum of its proper divisors (4160047).

20800205 is an equidigital number, since it uses as much as digits as its factorization.

20800205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4160046.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20800205 is about 4560.7241749529. The cubic root of 20800205 is about 275.0146769026.

The spelling of 20800205 in words is "twenty million, eight hundred thousand, two hundred five".