204520445 has 4 divisors (see below), whose sum is σ = 245424540. Its totient is φ = 163616352.

The previous prime is 204520429. The next prime is 204520451. The reversal of 204520445 is 544025402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544025402 = 2 ⋅272012701.

It can be written as a sum of positive squares in 2 ways, for example, as 89151364 + 115369081 = 9442^2 + 10741^2 .

It is a cyclic number.

It is not a de Polignac number, because 204520445 - 2⁴ = 204520429 is a prime.

It is a super-2 number, since 2×204520445² = 83657224845996050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20452040 + ... + 20452049.

It is an arithmetic number, because the mean of its divisors is an integer number (61356135).

Almost surely, 2^204520445 is an apocalyptic number.

It is an amenable number.

204520445 is a deficient number, since it is larger than the sum of its proper divisors (40904095).

204520445 is an equidigital number, since it uses as much as digits as its factorization.

204520445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40904094.

The product of its (nonzero) digits is 6400, while the sum is 26.

The square root of 204520445 is about 14301.0644708707. The cubic root of 204520445 is about 589.1767172861.

Adding to 204520445 its reverse (544025402), we get a palindrome (748545847).

The spelling of 204520445 in words is "two hundred four million, five hundred twenty thousand, four hundred forty-five".