20043504 has 160 divisors (see below), whose sum is σ = 64162560. Its totient is φ = 5951232.

The previous prime is 20043469. The next prime is 20043559. The reversal of 20043504 is 40534002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 241447 + ... + 241529.

It is an arithmetic number, because the mean of its divisors is an integer number (401016).

Almost surely, 2^20043504 is an apocalyptic number.

20043504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20043504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32081280).

20043504 is an abundant number, since it is smaller than the sum of its proper divisors (44119056).

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

20043504 is a wasteful number, since it uses less digits than its factorization.

20043504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156 (or 144 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20043504 is about 4476.9972079509. The cubic root of 20043504 is about 271.6384325022.

Adding to 20043504 its reverse (40534002), we get a palindrome (60577506).

The spelling of 20043504 in words is "twenty million, forty-three thousand, five hundred four".