22505403 has 4 divisors (see below), whose sum is σ = 30007208. Its totient is φ = 15003600.

The previous prime is 22505387. The next prime is 22505423. The reversal of 22505403 is 30450522.

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

It is not a de Polignac number, because 22505403 - 2⁴ = 22505387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22505403.

It is not an unprimeable number, because it can be changed into a prime (22505423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3750898 + ... + 3750903.

It is an arithmetic number, because the mean of its divisors is an integer number (7501802).

Almost surely, 2^22505403 is an apocalyptic number.

22505403 is a deficient number, since it is larger than the sum of its proper divisors (7501805).

22505403 is an equidigital number, since it uses as much as digits as its factorization.

22505403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7501804.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 22505403 is about 4743.9859822727. The cubic root of 22505403 is about 282.3334042676. Note that the first 3 decimals are identical.

Adding to 22505403 its reverse (30450522), we get a palindrome (52955925).

The spelling of 22505403 in words is "twenty-two million, five hundred five thousand, four hundred three".