20004123105 has 24 divisors (see below), whose sum is σ = 35328040488. Its totient is φ = 10467565056.

The previous prime is 20004123101. The next prime is 20004123119. The reversal of 20004123105 is 50132140002.

It can be written as a sum of positive squares in 4 ways, for example, as 2964475809 + 17039647296 = 54447^2 + 130536^2 .

It is not a de Polignac number, because 20004123105 - 2² = 20004123101 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20004123101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4191352 + ... + 4196121.

It is an arithmetic number, because the mean of its divisors is an integer number (1472001687).

Almost surely, 2^20004123105 is an apocalyptic number.

It is an amenable number.

20004123105 is a deficient number, since it is larger than the sum of its proper divisors (15323917383).

20004123105 is a wasteful number, since it uses less digits than its factorization.

20004123105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8387537 (or 8387534 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

Adding to 20004123105 its reverse (50132140002), we get a palindrome (70136263107).

The spelling of 20004123105 in words is "twenty billion, four million, one hundred twenty-three thousand, one hundred five".