20208404 has 12 divisors (see below), whose sum is σ = 36505728. Its totient is φ = 9778200.

The previous prime is 20208403. The next prime is 20208413. The reversal of 20208404 is 40480202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20208403) 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, 81362 + ... + 81609.

It is an arithmetic number, because the mean of its divisors is an integer number (3042144).

Almost surely, 2^20208404 is an apocalyptic number.

It is an amenable number.

20208404 is a deficient number, since it is larger than the sum of its proper divisors (16297324).

20208404 is a wasteful number, since it uses less digits than its factorization.

20208404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163006 (or 163004 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 20208404 is about 4495.3758463559. The cubic root of 20208404 is about 272.3813314904.

Adding to 20208404 its reverse (40480202), we get a palindrome (60688606).

The spelling of 20208404 in words is "twenty million, two hundred eight thousand, four hundred four".