20005405503 has 16 divisors (see below), whose sum is σ = 28265448960. Its totient is φ = 12542400896.

The previous prime is 20005405481. The next prime is 20005405517. The reversal of 20005405503 is 30550450002.

It is not a de Polignac number, because 20005405503 - 2⁶ = 20005405439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20005405573) 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 15 ways as a sum of consecutive naturals, for example, 91575 + ... + 219992.

It is an arithmetic number, because the mean of its divisors is an integer number (1766590560).

Almost surely, 2^20005405503 is an apocalyptic number.

20005405503 is a deficient number, since it is larger than the sum of its proper divisors (8260043457).

20005405503 is a wasteful number, since it uses less digits than its factorization.

20005405503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312846.

The product of its (nonzero) digits is 3000, while the sum is 24.

Adding to 20005405503 its reverse (30550450002), we get a palindrome (50555855505).

The spelling of 20005405503 in words is "twenty billion, five million, four hundred five thousand, five hundred three".