205690105 has 8 divisors (see below), whose sum is σ = 259819200. Its totient is φ = 155891376.

The previous prime is 205690103. The next prime is 205690151. The reversal of 205690105 is 501096502.

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

It is a cyclic number.

It is not a de Polignac number, because 205690105 - 2¹ = 205690103 is a prime.

It is a super-2 number, since 2×205690105² = 84616838589822050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (205690103) 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 7 ways as a sum of consecutive naturals, for example, 1082485 + ... + 1082674.

It is an arithmetic number, because the mean of its divisors is an integer number (32477400).

Almost surely, 2^205690105 is an apocalyptic number.

It is an amenable number.

205690105 is a deficient number, since it is larger than the sum of its proper divisors (54129095).

205690105 is a wasteful number, since it uses less digits than its factorization.

205690105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165183.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 205690105 is about 14341.9003273625. The cubic root of 205690105 is about 590.2977573938.

The spelling of 205690105 in words is "two hundred five million, six hundred ninety thousand, one hundred five".