20517422471503 has 4 divisors (see below), whose sum is σ = 20953963375200. Its totient is φ = 20080881567808.

The previous prime is 20517422471453. The next prime is 20517422471543. The reversal of 20517422471503 is 30517422471502.

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 20517422471503 - 2⁹ = 20517422470991 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 20517422471503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20517422471543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218270451778 + ... + 218270451871.

It is an arithmetic number, because the mean of its divisors is an integer number (5238490843800).

Almost surely, 2^{20517422471503} is an apocalyptic number.

20517422471503 is a deficient number, since it is larger than the sum of its proper divisors (436540903697).

20517422471503 is an equidigital number, since it uses as much as digits as its factorization.

20517422471503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436540903696.

The product of its (nonzero) digits is 470400, while the sum is 43.

Subtracting 20517422471503 from its reverse (30517422471502), we obtain a palindrome (9999999999999).

The spelling of 20517422471503 in words is "twenty trillion, five hundred seventeen billion, four hundred twenty-two million, four hundred seventy-one thousand, five hundred three".