20116543 has 2 divisors, whose sum is σ = 20116544. Its totient is φ = 20116542.

The previous prime is 20116531. The next prime is 20116619. The reversal of 20116543 is 34561102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20116543 - 2¹³ = 20108351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20116843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058271 + 10058272.

It is an arithmetic number, because the mean of its divisors is an integer number (10058272).

Almost surely, 2^20116543 is an apocalyptic number.

20116543 is a deficient number, since it is larger than the sum of its proper divisors (1).

20116543 is an equidigital number, since it uses as much as digits as its factorization.

20116543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 20116543 is about 4485.1469318184. The cubic root of 20116543 is about 271.9679848060.

Adding to 20116543 its reverse (34561102), we get a palindrome (54677645).

The spelling of 20116543 in words is "twenty million, one hundred sixteen thousand, five hundred forty-three".