205601830 has 32 divisors (see below), whose sum is σ = 441345024. Its totient is φ = 67426656.

The previous prime is 205601821. The next prime is 205601849. The reversal of 205601830 is 38106502.

It is a happy number.

It is a super-2 number, since 2×205601830² = 84544224998697800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205601795 and 205601804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62242 + ... + 65461.

It is an arithmetic number, because the mean of its divisors is an integer number (13792032).

Almost surely, 2^205601830 is an apocalyptic number.

205601830 is an abundant number, since it is smaller than the sum of its proper divisors (235743194).

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

205601830 is a wasteful number, since it uses less digits than its factorization.

205601830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127740.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 205601830 is about 14338.8224760613. The cubic root of 205601830 is about 590.2133002591.

The spelling of 205601830 in words is "two hundred five million, six hundred one thousand, eight hundred thirty".