20417143 has 2 divisors, whose sum is σ = 20417144. Its totient is φ = 20417142.

The previous prime is 20417107. The next prime is 20417149. The reversal of 20417143 is 34171402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20417143 - 2²¹ = 18319991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20417149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10208571 + 10208572.

It is an arithmetic number, because the mean of its divisors is an integer number (10208572).

Almost surely, 2^20417143 is an apocalyptic number.

20417143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20417143 is an equidigital number, since it uses as much as digits as its factorization.

20417143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20417143 is about 4518.5332797270. The cubic root of 20417143 is about 273.3159584765.

Adding to 20417143 its reverse (34171402), we get a palindrome (54588545).

The spelling of 20417143 in words is "twenty million, four hundred seventeen thousand, one hundred forty-three".