205206730 has 16 divisors (see below), whose sum is σ = 369679464. Its totient is φ = 82014400.

The previous prime is 205206709. The next prime is 205206739. The reversal of 205206730 is 37602502.

205206730 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 100942209 + 104264521 = 10047^2 + 10211^2 .

It is a junction number, because it is equal to n+sod(n) for n = 205206695 and 205206704.

It is not an unprimeable number, because it can be changed into a prime (205206739) 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, 5124 + ... + 20896.

Almost surely, 2^205206730 is an apocalyptic number.

205206730 is a deficient number, since it is larger than the sum of its proper divisors (164472734).

205206730 is a wasteful number, since it uses less digits than its factorization.

205206730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17081.

The product of its (nonzero) digits is 2520, while the sum is 25.

The square root of 205206730 is about 14325.0385688835. The cubic root of 205206730 is about 589.8349916800.

The spelling of 205206730 in words is "two hundred five million, two hundred six thousand, seven hundred thirty".