20166143 has 2 divisors, whose sum is σ = 20166144. Its totient is φ = 20166142.

The previous prime is 20166127. The next prime is 20166161. The reversal of 20166143 is 34166102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20166143 - 2⁴ = 20166127 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20165143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10083071 + 10083072.

It is an arithmetic number, because the mean of its divisors is an integer number (10083072).

Almost surely, 2^20166143 is an apocalyptic number.

20166143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20166143 is an equidigital number, since it uses as much as digits as its factorization.

20166143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20166143 is about 4490.6728894454. The cubic root of 20166143 is about 272.1913257051.

The spelling of 20166143 in words is "twenty million, one hundred sixty-six thousand, one hundred forty-three".