204513445 has 4 divisors (see below), whose sum is σ = 245416140. Its totient is φ = 163610752.

The previous prime is 204513443. The next prime is 204513457. The reversal of 204513445 is 544315402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544315402 = 2 ⋅272157701.

It can be written as a sum of positive squares in 2 ways, for example, as 152917956 + 51595489 = 12366^2 + 7183^2 .

It is a cyclic number.

It is not a de Polignac number, because 204513445 - 2¹ = 204513443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204513443) 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, 20451340 + ... + 20451349.

It is an arithmetic number, because the mean of its divisors is an integer number (61354035).

Almost surely, 2^204513445 is an apocalyptic number.

It is an amenable number.

204513445 is a deficient number, since it is larger than the sum of its proper divisors (40902695).

204513445 is an equidigital number, since it uses as much as digits as its factorization.

204513445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40902694.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 204513445 is about 14300.8197317496. The cubic root of 204513445 is about 589.1699954087.

Adding to 204513445 its reverse (544315402), we get a palindrome (748828847).

The spelling of 204513445 in words is "two hundred four million, five hundred thirteen thousand, four hundred forty-five".