205144424 has 16 divisors (see below), whose sum is σ = 384989220. Its totient is φ = 102480640.

The previous prime is 205144421. The next prime is 205144439. The reversal of 205144424 is 424441502.

It can be written as a sum of positive squares in 2 ways, for example, as 202151524 + 2992900 = 14218^2 + 1730^2 .

It is a junction number, because it is equal to n+sod(n) for n = 205144393 and 205144402.

It is not an unprimeable number, because it can be changed into a prime (205144421) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1409 + ... + 20304.

Almost surely, 2^205144424 is an apocalyptic number.

It is an amenable number.

205144424 is a deficient number, since it is larger than the sum of its proper divisors (179844796).

205144424 is a wasteful number, since it uses less digits than its factorization.

205144424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22900 (or 22896 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 205144424 is about 14322.8636801444. The cubic root of 205144424 is about 589.7752893186.

Adding to 205144424 its reverse (424441502), we get a palindrome (629585926).

The spelling of 205144424 in words is "two hundred five million, one hundred forty-four thousand, four hundred twenty-four".