205445147 has 4 divisors (see below), whose sum is σ = 205485216. Its totient is φ = 205405080.

The previous prime is 205445129. The next prime is 205445159. The reversal of 205445147 is 741544502.

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

It is a cyclic number.

It is not a de Polignac number, because 205445147 - 2²⁰ = 204396571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205445047) 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, 10979 + ... + 23052.

It is an arithmetic number, because the mean of its divisors is an integer number (51371304).

Almost surely, 2^205445147 is an apocalyptic number.

205445147 is a deficient number, since it is larger than the sum of its proper divisors (40069).

205445147 is an equidigital number, since it uses as much as digits as its factorization.

205445147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40068.

The product of its (nonzero) digits is 22400, while the sum is 32.

The square root of 205445147 is about 14333.3578410643. The cubic root of 205445147 is about 590.0633341950.

Adding to 205445147 its reverse (741544502), we get a palindrome (946989649).

The spelling of 205445147 in words is "two hundred five million, four hundred forty-five thousand, one hundred forty-seven".