205661426 has 8 divisors (see below), whose sum is σ = 308577324. Its totient is φ = 102802320.

The previous prime is 205661381. The next prime is 205661441. The reversal of 205661426 is 624166502.

It can be written as a sum of positive squares in 2 ways, for example, as 190412401 + 15249025 = 13799^2 + 3905^2 .

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 205661392 and 205661401.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3545 + ... + 20588.

Almost surely, 2^205661426 is an apocalyptic number.

205661426 is a deficient number, since it is larger than the sum of its proper divisors (102915898).

205661426 is a wasteful number, since it uses less digits than its factorization.

205661426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28396.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 205661426 is about 14340.9004598735. The cubic root of 205661426 is about 590.2703214018.

The spelling of 205661426 in words is "two hundred five million, six hundred sixty-one thousand, four hundred twenty-six".