204445 has 8 divisors (see below), whose sum is σ = 253440. Its totient is φ = 158160.

The previous prime is 204443. The next prime is 204461. The reversal of 204445 is 544402.

204445 = T₉₉ + T₁₀₀ + ... + T₁₂₉.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 204445 - 2¹ = 204443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505 + ... + 814.

It is an arithmetic number, because the mean of its divisors is an integer number (31680).

2²⁰⁴⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

204445 is a deficient number, since it is larger than the sum of its proper divisors (48995).

204445 is a wasteful number, since it uses less digits than its factorization.

204445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 204445 is about 452.1559465494. The cubic root of 204445 is about 58.9104261768.

Adding to 204445 its reverse (544402), we get a palindrome (748847).

It can be divided in two parts, 20444 and 5, that added together give a square (20449 = 143²).

The spelling of 204445 in words is "two hundred four thousand, four hundred forty-five".