204781085 has 4 divisors (see below), whose sum is σ = 245737308. Its totient is φ = 163824864.

The previous prime is 204781067. The next prime is 204781091. The reversal of 204781085 is 580187402.

204781085 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 580187402 = 2 ⋅290093701.

It can be written as a sum of positive squares in 2 ways, for example, as 141467236 + 63313849 = 11894^2 + 7957^2 .

It is a cyclic number.

It is not a de Polignac number, because 204781085 - 2¹⁶ = 204715549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20478104 + ... + 20478113.

It is an arithmetic number, because the mean of its divisors is an integer number (61434327).

Almost surely, 2^204781085 is an apocalyptic number.

It is an amenable number.

204781085 is a deficient number, since it is larger than the sum of its proper divisors (40956223).

204781085 is an equidigital number, since it uses as much as digits as its factorization.

204781085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40956222.

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 204781085 is about 14310.1741778359. The cubic root of 204781085 is about 589.4268924905.

The spelling of 204781085 in words is "two hundred four million, seven hundred eighty-one thousand, eighty-five".