20442011123 has 4 divisors (see below), whose sum is σ = 20442657480. Its totient is φ = 20441364768.

The previous prime is 20442011111. The next prime is 20442011167. The reversal of 20442011123 is 32111024402.

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 20442011123 - 2²⁶ = 20374902259 is a prime.

It is a super-2 number, since 2×20442011123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20442011095 and 20442011104.

It is not an unprimeable number, because it can be changed into a prime (20442011923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273158 + ... + 339851.

It is an arithmetic number, because the mean of its divisors is an integer number (5110664370).

Almost surely, 2^20442011123 is an apocalyptic number.

20442011123 is a deficient number, since it is larger than the sum of its proper divisors (646357).

20442011123 is an equidigital number, since it uses as much as digits as its factorization.

20442011123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646356.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20442011123 its reverse (32111024402), we get a palindrome (52553035525).

The spelling of 20442011123 in words is "twenty billion, four hundred forty-two million, eleven thousand, one hundred twenty-three".