205680269 has 4 divisors (see below), whose sum is σ = 205721244. Its totient is φ = 205639296.

The previous prime is 205680253. The next prime is 205680281. The reversal of 205680269 is 962086502.

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 81090025 + 124590244 = 9005^2 + 11162^2 .

It is a cyclic number.

It is not a de Polignac number, because 205680269 - 2⁴ = 205680253 is a prime.

It is a super-2 number, since 2×205680269² = 84608746111824722, 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 (205680239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11702 + ... + 23415.

It is an arithmetic number, because the mean of its divisors is an integer number (51430311).

Almost surely, 2^205680269 is an apocalyptic number.

It is an amenable number.

205680269 is a deficient number, since it is larger than the sum of its proper divisors (40975).

205680269 is an equidigital number, since it uses as much as digits as its factorization.

205680269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40974.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 205680269 is about 14341.5574119410. The cubic root of 205680269 is about 590.2883479940.

The spelling of 205680269 in words is "two hundred five million, six hundred eighty thousand, two hundred sixty-nine".