20138117043 has 32 divisors (see below), whose sum is σ = 30979814400. Its totient is φ = 11507680800.

The previous prime is 20138116993. The next prime is 20138117059. The reversal of 20138117043 is 34071183102.

It is not a de Polignac number, because 20138117043 - 2⁸ = 20138116787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20138117043.

It is not an unprimeable number, because it can be changed into a prime (20138117093) 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 31 ways as a sum of consecutive naturals, for example, 56188 + ... + 208406.

It is an arithmetic number, because the mean of its divisors is an integer number (968119200).

Almost surely, 2^20138117043 is an apocalyptic number.

20138117043 is a deficient number, since it is larger than the sum of its proper divisors (10841697357).

20138117043 is a wasteful number, since it uses less digits than its factorization.

20138117043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152463.

The product of its (nonzero) digits is 4032, while the sum is 30.

The spelling of 20138117043 in words is "twenty billion, one hundred thirty-eight million, one hundred seventeen thousand, forty-three".