20717141 has 2 divisors, whose sum is σ = 20717142. Its totient is φ = 20717140.

The previous prime is 20717131. The next prime is 20717143. The reversal of 20717141 is 14171702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20702500 + 14641 = 4550^2 + 121^2 .

It is a cyclic number.

It is not a de Polignac number, because 20717141 - 2¹⁰ = 20716117 is a prime.

Together with 20717143, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20717143) 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, 10358570 + 10358571.

It is an arithmetic number, because the mean of its divisors is an integer number (10358571).

Almost surely, 2^20717141 is an apocalyptic number.

It is an amenable number.

20717141 is a deficient number, since it is larger than the sum of its proper divisors (1).

20717141 is an equidigital number, since it uses as much as digits as its factorization.

20717141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 23.

The square root of 20717141 is about 4551.6086167420. The cubic root of 20717141 is about 274.6481052734.

Adding to 20717141 its reverse (14171702), we get a palindrome (34888843).

The spelling of 20717141 in words is "twenty million, seven hundred seventeen thousand, one hundred forty-one".