20431430354403 has 6 divisors (see below), whose sum is σ = 29512066067484. Its totient is φ = 13620953569596.

The previous prime is 20431430354389. The next prime is 20431430354429. The reversal of 20431430354403 is 30445303413402.

It is a happy number.

20431430354403 is a `hidden beast` number, since 2 + 0 + 43 + 143 + 0 + 35 + 440 + 3 = 666.

It is not a de Polignac number, because 20431430354403 - 2⁵ = 20431430354371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20431430354473) 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 5 ways as a sum of consecutive naturals, for example, 1135079464125 + ... + 1135079464142.

It is an arithmetic number, because the mean of its divisors is an integer number (4918677677914).

Almost surely, 2^{20431430354403} is an apocalyptic number.

20431430354403 is a deficient number, since it is larger than the sum of its proper divisors (9080635713081).

20431430354403 is a wasteful number, since it uses less digits than its factorization.

20431430354403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270158928273 (or 2270158928270 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 36.

Adding to 20431430354403 its reverse (30445303413402), we get a palindrome (50876733767805).

The spelling of 20431430354403 in words is "twenty trillion, four hundred thirty-one billion, four hundred thirty million, three hundred fifty-four thousand, four hundred three".