20535943123 has 4 divisors (see below), whose sum is σ = 20536229848. Its totient is φ = 20535656400.

The previous prime is 20535943121. The next prime is 20535943163. The reversal of 20535943123 is 32134953502.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20535943123 - 2¹ = 20535943121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20535943121) 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, 65548 + ... + 212998.

It is an arithmetic number, because the mean of its divisors is an integer number (5134057462).

Almost surely, 2^20535943123 is an apocalyptic number.

20535943123 is a deficient number, since it is larger than the sum of its proper divisors (286725).

20535943123 is a wasteful number, since it uses less digits than its factorization.

20535943123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286724.

The product of its (nonzero) digits is 97200, while the sum is 37.

The spelling of 20535943123 in words is "twenty billion, five hundred thirty-five million, nine hundred forty-three thousand, one hundred twenty-three".