205905071 has 16 divisors (see below), whose sum is σ = 230169600. Its totient is φ = 183051648.

The previous prime is 205905019. The next prime is 205905083. The reversal of 205905071 is 170509502.

It is a de Polignac number, because none of the positive numbers 2^k-205905071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205904071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142370 + ... + 143808.

It is an arithmetic number, because the mean of its divisors is an integer number (14385600).

Almost surely, 2^205905071 is an apocalyptic number.

205905071 is a deficient number, since it is larger than the sum of its proper divisors (24264529).

205905071 is a wasteful number, since it uses less digits than its factorization.

205905071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 205905071 is about 14349.3927049196. The cubic root of 205905071 is about 590.5033251627.

The spelling of 205905071 in words is "two hundred five million, nine hundred five thousand, seventy-one".