20004243123 has 16 divisors (see below), whose sum is σ = 28791717120. Its totient is φ = 12316454304.

The previous prime is 20004243121. The next prime is 20004243137. The reversal of 20004243123 is 32134240002.

It is not a de Polignac number, because 20004243123 - 2¹ = 20004243121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20004243123.

It is not an unprimeable number, because it can be changed into a prime (20004243121) 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, 4996561 + ... + 5000562.

It is an arithmetic number, because the mean of its divisors is an integer number (1799482320).

Almost surely, 2^20004243123 is an apocalyptic number.

20004243123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20004243123 is a deficient number, since it is larger than the sum of its proper divisors (8787473997).

20004243123 is a wasteful number, since it uses less digits than its factorization.

20004243123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9997178.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20004243123 its reverse (32134240002), we get a palindrome (52138483125).

The spelling of 20004243123 in words is "twenty billion, four million, two hundred forty-three thousand, one hundred twenty-three".