1020200123 has 4 divisors (see below), whose sum is σ = 1025486328. Its totient is φ = 1014913920.

The previous prime is 1020200113. The next prime is 1020200143. The reversal of 1020200123 is 3210020201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3210020201 = 131 ⋅24503971.

It is a cyclic number.

It is not a de Polignac number, because 1020200123 - 2¹⁰ = 1020199099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020200113) 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, 2642813 + ... + 2643198.

It is an arithmetic number, because the mean of its divisors is an integer number (256371582).

Almost surely, 2^1020200123 is an apocalyptic number.

1020200123 is a deficient number, since it is larger than the sum of its proper divisors (5286205).

1020200123 is an equidigital number, since it uses as much as digits as its factorization.

1020200123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5286204.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1020200123 is about 31940.5717387776. The cubic root of 1020200123 is about 1006.6885380514.

Adding to 1020200123 its reverse (3210020201), we get a palindrome (4230220324).

The spelling of 1020200123 in words is "one billion, twenty million, two hundred thousand, one hundred twenty-three".