2820205 has 4 divisors (see below), whose sum is σ = 3384252. Its totient is φ = 2256160.

The previous prime is 2820197. The next prime is 2820211. The reversal of 2820205 is 5020282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5020282 = 2 ⋅2510141.

It can be written as a sum of positive squares in 2 ways, for example, as 1572516 + 1247689 = 1254^2 + 1117^2 .

It is not a de Polignac number, because 2820205 - 2³ = 2820197 is a prime.

It is a Duffinian number.

2820205 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282016 + ... + 282025.

It is an arithmetic number, because the mean of its divisors is an integer number (846063).

2^2820205 is an apocalyptic number.

It is an amenable number.

2820205 is a deficient number, since it is larger than the sum of its proper divisors (564047).

2820205 is an equidigital number, since it uses as much as digits as its factorization.

2820205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564046.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 2820205 is about 1679.3465991272. The cubic root of 2820205 is about 141.2841878245.

Adding to 2820205 its reverse (5020282), we get a palindrome (7840487).

It can be divided in two parts, 2820 and 205, that added together give a square (3025 = 55²).

The spelling of 2820205 in words is "two million, eight hundred twenty thousand, two hundred five".