20105541 has 24 divisors (see below), whose sum is σ = 30084600. Its totient is φ = 12928896.

The previous prime is 20105521. The next prime is 20105549. The reversal of 20105541 is 14550102.

20105541 is a `hidden beast` number, since 20 + 105 + 541 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13905441 + 6200100 = 3729^2 + 2490^2 .

It is not a de Polignac number, because 20105541 - 2¹¹ = 20103493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20105549) 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 in 23 ways as a sum of consecutive naturals, for example, 57435 + ... + 57783.

It is an arithmetic number, because the mean of its divisors is an integer number (1253525).

Almost surely, 2^20105541 is an apocalyptic number.

It is an amenable number.

20105541 is a deficient number, since it is larger than the sum of its proper divisors (9979059).

20105541 is a wasteful number, since it uses less digits than its factorization.

20105541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565 (or 562 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 20105541 is about 4483.9202713697. The cubic root of 20105541 is about 271.9183948172.

Adding to 20105541 its reverse (14550102), we get a palindrome (34655643).

The spelling of 20105541 in words is "twenty million, one hundred five thousand, five hundred forty-one".