20503424 has 16 divisors (see below), whose sum is σ = 40846920. Its totient is φ = 10251648.

The previous prime is 20503409. The next prime is 20503429. The reversal of 20503424 is 42430502.

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 20503396 and 20503405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20503429) 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 as a sum of consecutive naturals, namely, 79964 + ... + 80219.

Almost surely, 2^20503424 is an apocalyptic number.

It is an amenable number.

20503424 is a deficient number, since it is larger than the sum of its proper divisors (20343496).

20503424 is an equidigital number, since it uses as much as digits as its factorization.

20503424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160197 (or 160185 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20503424 is about 4528.0706708266. The cubic root of 20503424 is about 273.7004202586.

Adding to 20503424 its reverse (42430502), we get a palindrome (62933926).

The spelling of 20503424 in words is "twenty million, five hundred three thousand, four hundred twenty-four".