205666026 has 16 divisors (see below), whose sum is σ = 413041728. Its totient is φ = 68270400.

The previous prime is 205666009. The next prime is 205666067. The reversal of 205666026 is 620666502.

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, 69670 + ... + 72561.

It is an arithmetic number, because the mean of its divisors is an integer number (25815108).

Almost surely, 2^205666026 is an apocalyptic number.

205666026 is an abundant number, since it is smaller than the sum of its proper divisors (207375702).

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

205666026 is a wasteful number, since it uses less digits than its factorization.

205666026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142477.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 205666026 is about 14341.0608394219. The cubic root of 205666026 is about 590.2747221999.

The spelling of 205666026 in words is "two hundred five million, six hundred sixty-six thousand, twenty-six".