204113405 has 4 divisors (see below), whose sum is σ = 244936092. Its totient is φ = 163290720.

The previous prime is 204113383. The next prime is 204113471. The reversal of 204113405 is 504311402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 130256569 + 73856836 = 11413^2 + 8594^2 .

It is not a de Polignac number, because 204113405 - 2²² = 199919101 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, 20411336 + ... + 20411345.

It is an arithmetic number, because the mean of its divisors is an integer number (61234023).

Almost surely, 2^204113405 is an apocalyptic number.

It is an amenable number.

204113405 is a deficient number, since it is larger than the sum of its proper divisors (40822687).

204113405 is an equidigital number, since it uses as much as digits as its factorization.

204113405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40822686.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 204113405 is about 14286.8262745790. The cubic root of 204113405 is about 588.7855945892.

Adding to 204113405 its reverse (504311402), we get a palindrome (708424807).

The spelling of 204113405 in words is "two hundred four million, one hundred thirteen thousand, four hundred five".