20326403 has 4 divisors (see below), whose sum is σ = 20359248. Its totient is φ = 20293560.

The previous prime is 20326381. The next prime is 20326433. The reversal of 20326403 is 30462302.

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 20326403 - 2¹⁰ = 20325379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20326433) 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, 15476 + ... + 16737.

It is an arithmetic number, because the mean of its divisors is an integer number (5089812).

Almost surely, 2^20326403 is an apocalyptic number.

20326403 is a deficient number, since it is larger than the sum of its proper divisors (32845).

20326403 is an equidigital number, since it uses as much as digits as its factorization.

20326403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32844.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 20326403 is about 4508.4812298600. The cubic root of 20326403 is about 272.9104573793.

Adding to 20326403 its reverse (30462302), we get a palindrome (50788705).

The spelling of 20326403 in words is "twenty million, three hundred twenty-six thousand, four hundred three".