20123443 has 2 divisors, whose sum is σ = 20123444. Its totient is φ = 20123442.

The previous prime is 20123437. The next prime is 20123479. The reversal of 20123443 is 34432102.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20123443.

It is not a weakly prime, because it can be changed into another prime (20123483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061721 + 10061722.

It is an arithmetic number, because the mean of its divisors is an integer number (10061722).

Almost surely, 2^20123443 is an apocalyptic number.

20123443 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123443 is an equidigital number, since it uses as much as digits as its factorization.

20123443 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20123443 is about 4485.9160714396. The cubic root of 20123443 is about 271.9990763737. Note that the first 3 decimals are identical.

Adding to 20123443 its reverse (34432102), we get a palindrome (54555545).

The spelling of 20123443 in words is "twenty million, one hundred twenty-three thousand, four hundred forty-three".