20404433 has 6 divisors (see below), whose sum is σ = 23735826. Its totient is φ = 17489472.

The previous prime is 20404421. The next prime is 20404441. The reversal of 20404433 is 33440402.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20322064 + 82369 = 4508^2 + 287^2 .

It is not a de Polignac number, because 20404433 - 2¹² = 20400337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20404453) 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 5 ways as a sum of consecutive naturals, for example, 208160 + ... + 208257.

It is an arithmetic number, because the mean of its divisors is an integer number (3955971).

Almost surely, 2^20404433 is an apocalyptic number.

It is an amenable number.

20404433 is a deficient number, since it is larger than the sum of its proper divisors (3331393).

20404433 is an equidigital number, since it uses as much as digits as its factorization.

20404433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416431 (or 416424 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 20404433 is about 4517.1266309458. The cubic root of 20404433 is about 273.2592321767.

Adding to 20404433 its reverse (33440402), we get a palindrome (53844835).

The spelling of 20404433 in words is "twenty million, four hundred four thousand, four hundred thirty-three".