20305541 has 2 divisors, whose sum is σ = 20305542. Its totient is φ = 20305540.

The previous prime is 20305517. The next prime is 20305553. The reversal of 20305541 is 14550302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14853316 + 5452225 = 3854^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 20305541 - 2⁶ = 20305477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20305591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152770 + 10152771.

It is an arithmetic number, because the mean of its divisors is an integer number (10152771).

Almost surely, 2^20305541 is an apocalyptic number.

It is an amenable number.

20305541 is a deficient number, since it is larger than the sum of its proper divisors (1).

20305541 is an equidigital number, since it uses as much as digits as its factorization.

20305541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 20305541 is about 4506.1669964616. The cubic root of 20305541 is about 272.8170582193.

Adding to 20305541 its reverse (14550302), we get a palindrome (34855843).

The spelling of 20305541 in words is "twenty million, three hundred five thousand, five hundred forty-one".