205122306 has 16 divisors (see below), whose sum is σ = 434376864. Its totient is φ = 64352064.

The previous prime is 205122293. The next prime is 205122329. The reversal of 205122306 is 603221502.

It is an unprimeable number.

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, 1005400 + ... + 1005603.

It is an arithmetic number, because the mean of its divisors is an integer number (27148554).

Almost surely, 2^205122306 is an apocalyptic number.

205122306 is an abundant number, since it is smaller than the sum of its proper divisors (229254558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205122306 is a wasteful number, since it uses less digits than its factorization.

205122306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011025.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 205122306 is about 14322.0915372022. The cubic root of 205122306 is about 589.7540926767.

Adding to 205122306 its reverse (603221502), we get a palindrome (808343808).

The spelling of 205122306 in words is "two hundred five million, one hundred twenty-two thousand, three hundred six".