205271930 has 16 divisors (see below), whose sum is σ = 379476360. Its totient is φ = 79889472.

The previous prime is 205271929. The next prime is 205271933. The reversal of 205271930 is 39172502.

It can be written as a sum of positive squares in 4 ways, for example, as 204289849 + 982081 = 14293^2 + 991^2 .

It is a junction number, because it is equal to n+sod(n) for n = 205271893 and 205271902.

It is not an unprimeable number, because it can be changed into a prime (205271933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277025 + ... + 277764.

Almost surely, 2^205271930 is an apocalyptic number.

205271930 is a deficient number, since it is larger than the sum of its proper divisors (174204430).

205271930 is a wasteful number, since it uses less digits than its factorization.

205271930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554833.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 205271930 is about 14327.3141237288. The cubic root of 205271930 is about 589.8974541687.

The spelling of 205271930 in words is "two hundred five million, two hundred seventy-one thousand, nine hundred thirty".