205705071 has 24 divisors (see below), whose sum is σ = 349077456. Its totient is φ = 115079040.

The previous prime is 205705067. The next prime is 205705103. The reversal of 205705071 is 170507502.

205705071 is a `hidden beast` number, since 20 + 570 + 5 + 0 + 71 = 666.

It is not a de Polignac number, because 205705071 - 2² = 205705067 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205705061) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78630 + ... + 81203.

It is an arithmetic number, because the mean of its divisors is an integer number (14544894).

Almost surely, 2^205705071 is an apocalyptic number.

205705071 is a deficient number, since it is larger than the sum of its proper divisors (143372385).

205705071 is a wasteful number, since it uses less digits than its factorization.

205705071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159863 (or 159860 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 27.

The square root of 205705071 is about 14342.4220757862. The cubic root of 205705071 is about 590.3120737233.

The spelling of 205705071 in words is "two hundred five million, seven hundred five thousand, seventy-one".