20006743 has 2 divisors, whose sum is σ = 20006744. Its totient is φ = 20006742.

The previous prime is 20006741. The next prime is 20006797. The reversal of 20006743 is 34760002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20006743 - 2¹ = 20006741 is a prime.

Together with 20006741, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20006741) 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, 10003371 + 10003372.

It is an arithmetic number, because the mean of its divisors is an integer number (10003372).

Almost surely, 2^20006743 is an apocalyptic number.

20006743 is a deficient number, since it is larger than the sum of its proper divisors (1).

20006743 is an equidigital number, since it uses as much as digits as its factorization.

20006743 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 20006743 is about 4472.8897817854. The cubic root of 20006743 is about 271.4722637618.

Adding to 20006743 its reverse (34760002), we get a palindrome (54766745).

The spelling of 20006743 in words is "twenty million, six thousand, seven hundred forty-three".