20424403 has 4 divisors (see below), whose sum is σ = 20491240. Its totient is φ = 20357568.

The previous prime is 20424401. The next prime is 20424409. The reversal of 20424403 is 30442402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20424403 - 2¹ = 20424401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20424401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32958 + ... + 33571.

It is an arithmetic number, because the mean of its divisors is an integer number (5122810).

Almost surely, 2^20424403 is an apocalyptic number.

20424403 is a deficient number, since it is larger than the sum of its proper divisors (66837).

20424403 is an equidigital number, since it uses as much as digits as its factorization.

20424403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66836.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 20424403 is about 4519.3365663557. The cubic root of 20424403 is about 273.3483501896.

Adding to 20424403 its reverse (30442402), we get a palindrome (50866805).

The spelling of 20424403 in words is "twenty million, four hundred twenty-four thousand, four hundred three".