20004123423 has 16 divisors (see below), whose sum is σ = 27370949760. Its totient is φ = 12990310944.

The previous prime is 20004123413. The next prime is 20004123427. The reversal of 20004123423 is 32432140002.

It is not a de Polignac number, because 20004123423 - 2⁹ = 20004122911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20004123423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004123427) 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, 430461 + ... + 474662.

It is an arithmetic number, because the mean of its divisors is an integer number (1710684360).

Almost surely, 2^20004123423 is an apocalyptic number.

20004123423 is a deficient number, since it is larger than the sum of its proper divisors (7366826337).

20004123423 is a wasteful number, since it uses less digits than its factorization.

20004123423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 905318.

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

Adding to 20004123423 its reverse (32432140002), we get a palindrome (52436263425).

The spelling of 20004123423 in words is "twenty billion, four million, one hundred twenty-three thousand, four hundred twenty-three".