205680270 has 16 divisors (see below), whose sum is σ = 493632720. Its totient is φ = 54848064.

The previous prime is 205680253. The next prime is 205680281. The reversal of 205680270 is 72086502.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 6856009 = 205680270 / (2 + 0 + 5 + 6 + 8 + 0 + 2 + 7 + 0).

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 in 7 ways as a sum of consecutive naturals, for example, 3427975 + ... + 3428034.

It is an arithmetic number, because the mean of its divisors is an integer number (30852045).

Almost surely, 2^205680270 is an apocalyptic number.

205680270 is an abundant number, since it is smaller than the sum of its proper divisors (287952450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205680270 is a wasteful number, since it uses less digits than its factorization.

205680270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6856019.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 205680270 is about 14341.5574468047. The cubic root of 205680270 is about 590.2883489507.

The spelling of 205680270 in words is "two hundred five million, six hundred eighty thousand, two hundred seventy".