205705072 has 10 divisors (see below), whose sum is σ = 398553608. Its totient is φ = 102852528.

The previous prime is 205705067. The next prime is 205705103. The reversal of 205705072 is 270507502.

It is a self number, because there is not a number n which added to its sum of digits gives 205705072.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 6428268 + ... + 6428299.

Almost surely, 2^205705072 is an apocalyptic number.

It is an amenable number.

205705072 is a deficient number, since it is larger than the sum of its proper divisors (192848536).

205705072 is a wasteful number, since it uses less digits than its factorization.

205705072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12856575 (or 12856569 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 28.

The square root of 205705072 is about 14342.4221106478. The cubic root of 205705072 is about 590.3120746799.

The spelling of 205705072 in words is "two hundred five million, seven hundred five thousand, seventy-two".