20235143 has 2 divisors, whose sum is σ = 20235144. Its totient is φ = 20235142.

The previous prime is 20235121. The next prime is 20235161. The reversal of 20235143 is 34153202.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20235143 - 2⁸ = 20234887 is a prime.

It is a super-2 number, since 2×20235143² = 818922024460898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20235043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10117571 + 10117572.

It is an arithmetic number, because the mean of its divisors is an integer number (10117572).

Almost surely, 2^20235143 is an apocalyptic number.

20235143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20235143 is an equidigital number, since it uses as much as digits as its factorization.

20235143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 20235143 is about 4498.3489193258. The cubic root of 20235143 is about 272.5014134539.

Adding to 20235143 its reverse (34153202), we get a palindrome (54388345).

The spelling of 20235143 in words is "twenty million, two hundred thirty-five thousand, one hundred forty-three".