20404304 has 10 divisors (see below), whose sum is σ = 39533370. Its totient is φ = 10202144.

The previous prime is 20404261. The next prime is 20404331. The reversal of 20404304 is 40340402.

It can be written as a sum of positive squares in only one way, i.e., 16974400 + 3429904 = 4120^2 + 1852^2 .

It is a congruent number.

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 as a sum of consecutive naturals, namely, 637619 + ... + 637650.

It is an arithmetic number, because the mean of its divisors is an integer number (3953337).

Almost surely, 2^20404304 is an apocalyptic number.

It is an amenable number.

20404304 is a deficient number, since it is larger than the sum of its proper divisors (19129066).

20404304 is a wasteful number, since it uses less digits than its factorization.

20404304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275277 (or 1275271 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 20404304 is about 4517.1123519346. The cubic root of 20404304 is about 273.2586563130.

Adding to 20404304 its reverse (40340402), we get a palindrome (60744706).

The spelling of 20404304 in words is "twenty million, four hundred four thousand, three hundred four".