204456985 has 8 divisors (see below), whose sum is σ = 245968776. Its totient is φ = 163152000.

The previous prime is 204456983. The next prime is 204457009. The reversal of 204456985 is 589654402.

It can be written as a sum of positive squares in 4 ways, for example, as 3356224 + 201100761 = 1832^2 + 14181^2 .

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

It is not a de Polignac number, because 204456985 - 2¹ = 204456983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204456983) 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 7 ways as a sum of consecutive naturals, for example, 49516 + ... + 53485.

It is an arithmetic number, because the mean of its divisors is an integer number (30746097).

Almost surely, 2^204456985 is an apocalyptic number.

It is an amenable number.

204456985 is a deficient number, since it is larger than the sum of its proper divisors (41511791).

204456985 is a wasteful number, since it uses less digits than its factorization.

204456985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103403.

The product of its (nonzero) digits is 345600, while the sum is 43.

The square root of 204456985 is about 14298.8455827735. The cubic root of 204456985 is about 589.1157730575.

The spelling of 204456985 in words is "two hundred four million, four hundred fifty-six thousand, nine hundred eighty-five".