20424243123 has 16 divisors (see below), whose sum is σ = 30276961440. Its totient is φ = 13607691552.

The previous prime is 20424243121. The next prime is 20424243137. The reversal of 20424243123 is 32134242402.

20424243123 is a `hidden beast` number, since 204 + 2 + 4 + 2 + 431 + 23 = 666.

It is not a de Polignac number, because 20424243123 - 2¹ = 20424243121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (20424243121) 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 15 ways as a sum of consecutive naturals, for example, 190936 + ... + 278037.

It is an arithmetic number, because the mean of its divisors is an integer number (1892310090).

Almost surely, 2^20424243123 is an apocalyptic number.

20424243123 is a deficient number, since it is larger than the sum of its proper divisors (9852718317).

20424243123 is a wasteful number, since it uses less digits than its factorization.

20424243123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470595 (or 470589 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 20424243123 its reverse (32134242402), we get a palindrome (52558485525).

The spelling of 20424243123 in words is "twenty billion, four hundred twenty-four million, two hundred forty-three thousand, one hundred twenty-three".