20057171 has 2 divisors, whose sum is σ = 20057172. Its totient is φ = 20057170.

The previous prime is 20057143. The next prime is 20057189. The reversal of 20057171 is 17175002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20057171 - 2¹⁰ = 20056147 is a prime.

It is a Sophie Germain prime.

It is equal to p_1274027 and since 20057171 and 1274027 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20057131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10028585 + 10028586.

It is an arithmetic number, because the mean of its divisors is an integer number (10028586).

Almost surely, 2^20057171 is an apocalyptic number.

20057171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20057171 is an equidigital number, since it uses as much as digits as its factorization.

20057171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 490, while the sum is 23.

The square root of 20057171 is about 4478.5233057337. The cubic root of 20057171 is about 271.7001588845.

The spelling of 20057171 in words is "twenty million, fifty-seven thousand, one hundred seventy-one".