20404511125123 has 2 divisors, whose sum is σ = 20404511125124. Its totient is φ = 20404511125122.

The previous prime is 20404511125111. The next prime is 20404511125261. The reversal of 20404511125123 is 32152111540402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20404511125123 - 2¹³ = 20404511116931 is a prime.

It is not a weakly prime, because it can be changed into another prime (20404511122123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10202255562561 + 10202255562562.

It is an arithmetic number, because the mean of its divisors is an integer number (10202255562562).

Almost surely, 2^{20404511125123} is an apocalyptic number.

20404511125123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20404511125123 is an equidigital number, since it uses as much as digits as its factorization.

20404511125123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 20404511125123 its reverse (32152111540402), we get a palindrome (52556622665525).

The spelling of 20404511125123 in words is "twenty trillion, four hundred four billion, five hundred eleven million, one hundred twenty-five thousand, one hundred twenty-three".