20113431503 has 16 divisors (see below), whose sum is σ = 22568637696. Its totient is φ = 17767088640.

The previous prime is 20113431491. The next prime is 20113431517. The reversal of 20113431503 is 30513431102.

It is a cyclic number.

It is not a de Polignac number, because 20113431503 - 2¹⁰ = 20113430479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20113431523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18875 + ... + 201452.

It is an arithmetic number, because the mean of its divisors is an integer number (1410539856).

Almost surely, 2^20113431503 is an apocalyptic number.

20113431503 is a deficient number, since it is larger than the sum of its proper divisors (2455206193).

20113431503 is a wasteful number, since it uses less digits than its factorization.

20113431503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220574.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 20113431503 its reverse (30513431102), we get a palindrome (50626862605).

The spelling of 20113431503 in words is "twenty billion, one hundred thirteen million, four hundred thirty-one thousand, five hundred three".