20404421203 has 4 divisors (see below), whose sum is σ = 20406260880. Its totient is φ = 20402581528.

The previous prime is 20404421179. The next prime is 20404421209. The reversal of 20404421203 is 30212440402.

It is a happy number.

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 20404421203 - 2⁵ = 20404421171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20404421209) 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 3 ways as a sum of consecutive naturals, for example, 903100 + ... + 925417.

It is an arithmetic number, because the mean of its divisors is an integer number (5101565220).

Almost surely, 2^20404421203 is an apocalyptic number.

20404421203 is a deficient number, since it is larger than the sum of its proper divisors (1839677).

20404421203 is a wasteful number, since it uses less digits than its factorization.

20404421203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839676.

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 20404421203 its reverse (30212440402), we get a palindrome (50616861605).

The spelling of 20404421203 in words is "twenty billion, four hundred four million, four hundred twenty-one thousand, two hundred three".