20947141 has 2 divisors, whose sum is σ = 20947142. Its totient is φ = 20947140.

The previous prime is 20947133. The next prime is 20947153. The reversal of 20947141 is 14174902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15634116 + 5313025 = 3954^2 + 2305^2 .

It is a cyclic number.

It is not a de Polignac number, because 20947141 - 2³ = 20947133 is a prime.

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20947741) 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, 10473570 + 10473571.

It is an arithmetic number, because the mean of its divisors is an integer number (10473571).

Almost surely, 2^20947141 is an apocalyptic number.

It is an amenable number.

20947141 is a deficient number, since it is larger than the sum of its proper divisors (1).

20947141 is an equidigital number, since it uses as much as digits as its factorization.

20947141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 20947141 is about 4576.8046713837. The cubic root of 20947141 is about 275.6607406480.

The spelling of 20947141 in words is "twenty million, nine hundred forty-seven thousand, one hundred forty-one".