20662171 has 2 divisors, whose sum is σ = 20662172. Its totient is φ = 20662170.

The previous prime is 20662133. The next prime is 20662183. The reversal of 20662171 is 17126602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20662171 - 2¹³ = 20653979 is a prime.

It is not a weakly prime, because it can be changed into another prime (20662121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10331085 + 10331086.

It is an arithmetic number, because the mean of its divisors is an integer number (10331086).

Almost surely, 2^20662171 is an apocalyptic number.

20662171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20662171 is an equidigital number, since it uses as much as digits as its factorization.

20662171 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 25.

The square root of 20662171 is about 4545.5660813588. The cubic root of 20662171 is about 274.4049768255.

Adding to 20662171 its reverse (17126602), we get a palindrome (37788773).

The spelling of 20662171 in words is "twenty million, six hundred sixty-two thousand, one hundred seventy-one".