20102042423 has 4 divisors (see below), whose sum is σ = 20301072648. Its totient is φ = 19903012200.

The previous prime is 20102042399. The next prime is 20102042461. The reversal of 20102042423 is 32424020102.

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 20102042423 - 2⁸ = 20102042167 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102042395 and 20102042404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102048423) 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, 99514961 + ... + 99515162.

It is an arithmetic number, because the mean of its divisors is an integer number (5075268162).

Almost surely, 2^20102042423 is an apocalyptic number.

20102042423 is a deficient number, since it is larger than the sum of its proper divisors (199030225).

20102042423 is a wasteful number, since it uses less digits than its factorization.

20102042423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199030224.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20102042423 its reverse (32424020102), we get a palindrome (52526062525).

The spelling of 20102042423 in words is "twenty billion, one hundred two million, forty-two thousand, four hundred twenty-three".