205383505 has 4 divisors (see below), whose sum is σ = 246460212. Its totient is φ = 164306800.

The previous prime is 205383461. The next prime is 205383517. The reversal of 205383505 is 505383502.

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 32171584 + 173211921 = 5672^2 + 13161^2 .

It is a de Polignac number, because none of the positive numbers 2^k-205383505 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian 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, 20538346 + ... + 20538355.

It is an arithmetic number, because the mean of its divisors is an integer number (61615053).

Almost surely, 2^205383505 is an apocalyptic number.

It is an amenable number.

205383505 is a deficient number, since it is larger than the sum of its proper divisors (41076707).

205383505 is an equidigital number, since it uses as much as digits as its factorization.

205383505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41076706.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 205383505 is about 14331.2073810967. The cubic root of 205383505 is about 590.0043138629.

It can be divided in two parts, 2053 and 83505, that added together give a palindrome (85558).

The spelling of 205383505 in words is "two hundred five million, three hundred eighty-three thousand, five hundred five".