20106543 has 4 divisors (see below), whose sum is σ = 26808728. Its totient is φ = 13404360.

The previous prime is 20106521. The next prime is 20106589. The reversal of 20106543 is 34560102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 20106543 - 2⁸ = 20106287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20106143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3351088 + ... + 3351093.

It is an arithmetic number, because the mean of its divisors is an integer number (6702182).

Almost surely, 2^20106543 is an apocalyptic number.

20106543 is a deficient number, since it is larger than the sum of its proper divisors (6702185).

20106543 is an equidigital number, since it uses as much as digits as its factorization.

20106543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6702184.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 20106543 is about 4484.0320025620. The cubic root of 20106543 is about 271.9229119419.

Adding to 20106543 its reverse (34560102), we get a palindrome (54666645).

The spelling of 20106543 in words is "twenty million, one hundred six thousand, five hundred forty-three".