20204530 has 16 divisors (see below), whose sum is σ = 36419544. Its totient is φ = 8070400.

The previous prime is 20204519. The next prime is 20204533. The reversal of 20204530 is 3540202.

It can be written as a sum of positive squares in 4 ways, for example, as 4704561 + 15499969 = 2169^2 + 3937^2 .

It is not an unprimeable number, because it can be changed into a prime (20204533) 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 7 ways as a sum of consecutive naturals, for example, 12234 + ... + 13786.

Almost surely, 2^20204530 is an apocalyptic number.

20204530 is a deficient number, since it is larger than the sum of its proper divisors (16215014).

20204530 is a wasteful number, since it uses less digits than its factorization.

20204530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 20204530 is about 4494.9449384837. The cubic root of 20204530 is about 272.3639249911.

Adding to 20204530 its reverse (3540202), we get a palindrome (23744732).

The spelling of 20204530 in words is "twenty million, two hundred four thousand, five hundred thirty".