20200243123 has 4 divisors (see below), whose sum is σ = 20202895120. Its totient is φ = 20197591128.

The previous prime is 20200243111. The next prime is 20200243181. The reversal of 20200243123 is 32134200202.

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 20200243123 - 2²¹ = 20198145971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20200243123.

It is not an unprimeable number, because it can be changed into a prime (20200243423) 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, 1314540 + ... + 1329817.

It is an arithmetic number, because the mean of its divisors is an integer number (5050723780).

Almost surely, 2^20200243123 is an apocalyptic number.

20200243123 is a deficient number, since it is larger than the sum of its proper divisors (2651997).

20200243123 is an equidigital number, since it uses as much as digits as its factorization.

20200243123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651996.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 20200243123 its reverse (32134200202), we get a palindrome (52334443325).

The spelling of 20200243123 in words is "twenty billion, two hundred million, two hundred forty-three thousand, one hundred twenty-three".