20440143123 has 4 divisors (see below), whose sum is σ = 27253524168. Its totient is φ = 13626762080.

The previous prime is 20440143107. The next prime is 20440143223. The reversal of 20440143123 is 32134104402.

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 20440143123 - 2⁴ = 20440143107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20440143093 and 20440143102.

It is not an unprimeable number, because it can be changed into a prime (20440143223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3406690518 + ... + 3406690523.

It is an arithmetic number, because the mean of its divisors is an integer number (6813381042).

Almost surely, 2^20440143123 is an apocalyptic number.

20440143123 is a deficient number, since it is larger than the sum of its proper divisors (6813381045).

20440143123 is an equidigital number, since it uses as much as digits as its factorization.

20440143123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6813381044.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 20440143123 its reverse (32134104402), we get a palindrome (52574247525).

The spelling of 20440143123 in words is "twenty billion, four hundred forty million, one hundred forty-three thousand, one hundred twenty-three".