20430442123 has 16 divisors (see below), whose sum is σ = 25729935616. Its totient is φ = 15788818080.

The previous prime is 20430442111. The next prime is 20430442129. The reversal of 20430442123 is 32124403402.

It is a happy number.

It is not a de Polignac number, because 20430442123 - 2¹³ = 20430433931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20430442129) 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, 2606673 + ... + 2614498.

It is an arithmetic number, because the mean of its divisors is an integer number (1608120976).

Almost surely, 2^20430442123 is an apocalyptic number.

20430442123 is a deficient number, since it is larger than the sum of its proper divisors (5299493493).

20430442123 is a wasteful number, since it uses less digits than its factorization.

20430442123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5221234.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 20430442123 its reverse (32124403402), we get a palindrome (52554845525).

The spelling of 20430442123 in words is "twenty billion, four hundred thirty million, four hundred forty-two thousand, one hundred twenty-three".