20404244 has 12 divisors (see below), whose sum is σ = 40808544. Its totient is φ = 8744664.

The previous prime is 20404213. The next prime is 20404249. The reversal of 20404244 is 44240402.

20404244 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404249) 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, 364334 + ... + 364389.

It is an arithmetic number, because the mean of its divisors is an integer number (3400712).

Almost surely, 2^20404244 is an apocalyptic number.

It is an amenable number.

20404244 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20404244 is a wasteful number, since it uses less digits than its factorization.

20404244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728734 (or 728732 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

The square root of 20404244 is about 4517.1057105186. The cubic root of 20404244 is about 273.2583884687.

Adding to 20404244 its reverse (44240402), we get a palindrome (64644646).

The spelling of 20404244 in words is "twenty million, four hundred four thousand, two hundred forty-four".