20200123 has 2 divisors, whose sum is σ = 20200124. Its totient is φ = 20200122.

The previous prime is 20200121. The next prime is 20200133. The reversal of 20200123 is 32100202.

It is an a-pointer prime, because the next prime (20200133) can be obtained adding 20200123 to its sum of digits (10).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20200123 - 2¹ = 20200121 is a prime.

Together with 20200121, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20200121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100061 + 10100062.

It is an arithmetic number, because the mean of its divisors is an integer number (10100062).

Almost surely, 2^20200123 is an apocalyptic number.

20200123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200123 is an equidigital number, since it uses as much as digits as its factorization.

20200123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 20200123 is about 4494.4546943984. The cubic root of 20200123 is about 272.3441209323.

Adding to 20200123 its reverse (32100202), we get a palindrome (52300325).

The spelling of 20200123 in words is "twenty million, two hundred thousand, one hundred twenty-three".