205138330 has 8 divisors (see below), whose sum is σ = 369249012. Its totient is φ = 82055328.

The previous prime is 205138319. The next prime is 205138331. The reversal of 205138330 is 33831502.

It can be written as a sum of positive squares in 2 ways, for example, as 188760121 + 16378209 = 13739^2 + 4047^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 205138295 and 205138304.

It is not an unprimeable number, because it can be changed into a prime (205138331) 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 3 ways as a sum of consecutive naturals, for example, 10256907 + ... + 10256926.

Almost surely, 2^205138330 is an apocalyptic number.

205138330 is a deficient number, since it is larger than the sum of its proper divisors (164110682).

205138330 is a wasteful number, since it uses less digits than its factorization.

205138330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20513840.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 205138330 is about 14322.6509417775. The cubic root of 205138330 is about 589.7694493252.

Adding to 205138330 its reverse (33831502), we get a palindrome (238969832).

The spelling of 205138330 in words is "two hundred five million, one hundred thirty-eight thousand, three hundred thirty".