204021530 has 8 divisors (see below), whose sum is σ = 367238772. Its totient is φ = 81608608.

The previous prime is 204021511. The next prime is 204021533. The reversal of 204021530 is 35120402.

It can be written as a sum of positive squares in 2 ways, for example, as 190633249 + 13388281 = 13807^2 + 3659^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 204021499 and 204021508.

It is not an unprimeable number, because it can be changed into a prime (204021533) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10201067 + ... + 10201086.

Almost surely, 2^204021530 is an apocalyptic number.

204021530 is a deficient number, since it is larger than the sum of its proper divisors (163217242).

204021530 is a wasteful number, since it uses less digits than its factorization.

204021530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20402160.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 204021530 is about 14283.6105379557. The cubic root of 204021530 is about 588.6972404463.

Adding to 204021530 its reverse (35120402), we get a palindrome (239141932).

The spelling of 204021530 in words is "two hundred four million, twenty-one thousand, five hundred thirty".