20057143 has 2 divisors, whose sum is σ = 20057144. Its totient is φ = 20057142.

The previous prime is 20057137. The next prime is 20057171. The reversal of 20057143 is 34175002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20057143 is a prime.

It is equal to p_1274026 and since 20057143 and 1274026 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20057113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10028571 + 10028572.

It is an arithmetic number, because the mean of its divisors is an integer number (10028572).

Almost surely, 2^20057143 is an apocalyptic number.

20057143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20057143 is an equidigital number, since it uses as much as digits as its factorization.

20057143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20057143 is about 4478.5201797022. The cubic root of 20057143 is about 271.7000324524.

The spelling of 20057143 in words is "twenty million, fifty-seven thousand, one hundred forty-three".