20071 has 2 divisors, whose sum is σ = 20072. Its totient is φ = 20070.

The previous prime is 20063. The next prime is 20089. The reversal of 20071 is 17002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20071 - 2³ = 20063 is a prime.

It is a Chen prime.

20071 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10035 + 10036.

It is an arithmetic number, because the mean of its divisors is an integer number (10036).

2²⁰⁰⁷¹ is an apocalyptic number.

20071 is a deficient number, since it is larger than the sum of its proper divisors (1).

20071 is an equidigital number, since it uses as much as digits as its factorization.

20071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14, while the sum is 10.

The square root of 20071 is about 141.6721567564. The cubic root of 20071 is about 27.1762588398.

Adding to 20071 its reverse (17002), we get a palindrome (37073).

The spelling of 20071 in words is "twenty thousand, seventy-one", and thus it is an iban number.