20138743 has 2 divisors, whose sum is σ = 20138744. Its totient is φ = 20138742.

The previous prime is 20138707. The next prime is 20138801. The reversal of 20138743 is 34783102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20138743 - 2¹⁷ = 20007671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20138243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10069371 + 10069372.

It is an arithmetic number, because the mean of its divisors is an integer number (10069372).

Almost surely, 2^20138743 is an apocalyptic number.

20138743 is a deficient number, since it is larger than the sum of its proper divisors (1).

20138743 is an equidigital number, since it uses as much as digits as its factorization.

20138743 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 20138743 is about 4487.6210847174. The cubic root of 20138743 is about 272.0679932024.

The spelling of 20138743 in words is "twenty million, one hundred thirty-eight thousand, seven hundred forty-three".