205530769 has 4 divisors (see below), whose sum is σ = 205911220. Its totient is φ = 205150320.

The previous prime is 205530763. The next prime is 205530797. The reversal of 205530769 is 967035502.

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 97121025 + 108409744 = 9855^2 + 10412^2 .

It is a cyclic number.

It is not a de Polignac number, because 205530769 - 2³ = 205530761 is a prime.

It is a super-2 number, since 2×205530769² = 84485794011462722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205530761) 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, 189414 + ... + 190495.

It is an arithmetic number, because the mean of its divisors is an integer number (51477805).

Almost surely, 2^205530769 is an apocalyptic number.

It is an amenable number.

205530769 is a deficient number, since it is larger than the sum of its proper divisors (380451).

205530769 is an equidigital number, since it uses as much as digits as its factorization.

205530769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380450.

The product of its (nonzero) digits is 56700, while the sum is 37.

The square root of 205530769 is about 14336.3443387776. The cubic root of 205530769 is about 590.1452950599.

The spelling of 205530769 in words is "two hundred five million, five hundred thirty thousand, seven hundred sixty-nine".