205220549 has 4 divisors (see below), whose sum is σ = 217292364. Its totient is φ = 193148736.

The previous prime is 205220453. The next prime is 205220551. The reversal of 205220549 is 945022502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114875524 + 90345025 = 10718^2 + 9505^2 .

It is a cyclic number.

It is not a de Polignac number, because 205220549 - 2²⁰ = 204171973 is a prime.

It is a super-2 number, since 2×205220549² = 84230947463722802, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205220569) 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, 6035882 + ... + 6035915.

It is an arithmetic number, because the mean of its divisors is an integer number (54323091).

Almost surely, 2^205220549 is an apocalyptic number.

It is an amenable number.

205220549 is a deficient number, since it is larger than the sum of its proper divisors (12071815).

205220549 is a wasteful number, since it uses less digits than its factorization.

205220549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12071814.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 205220549 is about 14325.5208980337. The cubic root of 205220549 is about 589.8482315751.

The spelling of 205220549 in words is "two hundred five million, two hundred twenty thousand, five hundred forty-nine".