20403344 has 40 divisors (see below), whose sum is σ = 42856632. Its totient is φ = 9354240.

The previous prime is 20403337. The next prime is 20403353. The reversal of 20403344 is 44330402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2016400 + 18386944 = 1420^2 + 4288^2 .

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 in 7 ways as a sum of consecutive naturals, for example, 48254 + ... + 48674.

Almost surely, 2^20403344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20403344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21428316).

20403344 is an abundant number, since it is smaller than the sum of its proper divisors (22453288).

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

20403344 is a wasteful number, since it uses less digits than its factorization.

20403344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675 (or 669 counting only the distinct ones).

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

The square root of 20403344 is about 4517.0060881075. The cubic root of 20403344 is about 273.2543707397.

Adding to 20403344 its reverse (44330402), we get a palindrome (64733746).

The spelling of 20403344 in words is "twenty million, four hundred three thousand, three hundred forty-four".