20501144123 has 4 divisors (see below), whose sum is σ = 20508151200. Its totient is φ = 20494137048.

The previous prime is 20501144089. The next prime is 20501144137. The reversal of 20501144123 is 32144110502.

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 20501144123 - 2¹⁰ = 20501143099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20501944123) 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, 3499148 + ... + 3505001.

It is an arithmetic number, because the mean of its divisors is an integer number (5127037800).

Almost surely, 2^20501144123 is an apocalyptic number.

20501144123 is a deficient number, since it is larger than the sum of its proper divisors (7007077).

20501144123 is an equidigital number, since it uses as much as digits as its factorization.

20501144123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007076.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 20501144123 its reverse (32144110502), we get a palindrome (52645254625).

The spelling of 20501144123 in words is "twenty billion, five hundred one million, one hundred forty-four thousand, one hundred twenty-three".