20443504 has 40 divisors (see below), whose sum is σ = 41952672. Its totient is φ = 9630720.

The previous prime is 20443459. The next prime is 20443523. The reversal of 20443504 is 40534402.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26484 + ... + 27244.

Almost surely, 2^20443504 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 20443504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20976336).

20443504 is an abundant number, since it is smaller than the sum of its proper divisors (21509168).

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

20443504 is a wasteful number, since it uses less digits than its factorization.

20443504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 20443504 is about 4521.4493251611. The cubic root of 20443504 is about 273.4335358707.

Adding to 20443504 its reverse (40534402), we get a palindrome (60977906).

The spelling of 20443504 in words is "twenty million, four hundred forty-three thousand, five hundred four".