20523105123 has 4 divisors (see below), whose sum is σ = 27364140168. Its totient is φ = 13682070080.

The previous prime is 20523105079. The next prime is 20523105133. The reversal of 20523105123 is 32150132502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20523105123 - 2¹³ = 20523096931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20523105093 and 20523105102.

It is not an unprimeable number, because it can be changed into a prime (20523105133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3420517518 + ... + 3420517523.

It is an arithmetic number, because the mean of its divisors is an integer number (6841035042).

Almost surely, 2^20523105123 is an apocalyptic number.

20523105123 is a deficient number, since it is larger than the sum of its proper divisors (6841035045).

20523105123 is an equidigital number, since it uses as much as digits as its factorization.

20523105123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6841035044.

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 20523105123 its reverse (32150132502), we get a palindrome (52673237625).

The spelling of 20523105123 in words is "twenty billion, five hundred twenty-three million, one hundred five thousand, one hundred twenty-three".