204243445 has 32 divisors (see below), whose sum is σ = 296167680. Its totient is φ = 132088320.

The previous prime is 204243443. The next prime is 204243449. The reversal of 204243445 is 544342402.

It is not a de Polignac number, because 204243445 - 2¹ = 204243443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204243443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186319 + ... + 187411.

It is an arithmetic number, because the mean of its divisors is an integer number (9255240).

Almost surely, 2^204243445 is an apocalyptic number.

It is an amenable number.

204243445 is a deficient number, since it is larger than the sum of its proper divisors (91924235).

204243445 is a wasteful number, since it uses less digits than its factorization.

204243445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405.

The product of its (nonzero) digits is 15360, while the sum is 28.

The square root of 204243445 is about 14291.3765956957. The cubic root of 204243445 is about 588.9106058537.

Adding to 204243445 its reverse (544342402), we get a palindrome (748585847).

The spelling of 204243445 in words is "two hundred four million, two hundred forty-three thousand, four hundred forty-five".