20530404 has 36 divisors (see below), whose sum is σ = 52752700. Its totient is φ = 6730560.

The previous prime is 20530397. The next prime is 20530417. The reversal of 20530404 is 40403502.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8294400 + 12236004 = 2880^2 + 3498^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 2479 + ... + 6870.

Almost surely, 2^20530404 is an apocalyptic number.

It is an amenable number.

20530404 is an abundant number, since it is smaller than the sum of its proper divisors (32222296).

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

20530404 is a wasteful number, since it uses less digits than its factorization.

20530404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9420 (or 9415 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20530404 is about 4531.0488851920. The cubic root of 20530404 is about 273.8204197394.

Adding to 20530404 its reverse (40403502), we get a palindrome (60933906).

The spelling of 20530404 in words is "twenty million, five hundred thirty thousand, four hundred four".