20404330 has 8 divisors (see below), whose sum is σ = 36727812. Its totient is φ = 8161728.

The previous prime is 20404261. The next prime is 20404331. The reversal of 20404330 is 3340402.

It can be written as a sum of positive squares in 2 ways, for example, as 19954089 + 450241 = 4467^2 + 671^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20404331) 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, 1020207 + ... + 1020226.

Almost surely, 2^20404330 is an apocalyptic number.

20404330 is a deficient number, since it is larger than the sum of its proper divisors (16323482).

20404330 is a wasteful number, since it uses less digits than its factorization.

20404330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040440.

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 20404330 is about 4517.1152298785. The cubic root of 20404330 is about 273.2587723788.

Adding to 20404330 its reverse (3340402), we get a palindrome (23744732).

The spelling of 20404330 in words is "twenty million, four hundred four thousand, three hundred thirty".