20503224 has 96 divisors (see below), whose sum is σ = 67223520. Its totient is φ = 5511168.

The previous prime is 20503213. The next prime is 20503229. The reversal of 20503224 is 42230502.

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

It is a junction number, because it is equal to n+sod(n) for n = 20503197 and 20503206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503229) 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 23 ways as a sum of consecutive naturals, for example, 7372 + ... + 9764.

It is an arithmetic number, because the mean of its divisors is an integer number (700245).

Almost surely, 2^20503224 is an apocalyptic number.

20503224 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 20503224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33611760).

20503224 is an abundant number, since it is smaller than the sum of its proper divisors (46720296).

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

20503224 is a wasteful number, since it uses less digits than its factorization.

20503224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2429 (or 2422 counting only the distinct ones).

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

The square root of 20503224 is about 4528.0485863118. The cubic root of 20503224 is about 273.6995303217.

Adding to 20503224 its reverse (42230502), we get a palindrome (62733726).

The spelling of 20503224 in words is "twenty million, five hundred three thousand, two hundred twenty-four".