20647141 has 2 divisors, whose sum is σ = 20647142. Its totient is φ = 20647140.

The previous prime is 20647139. The next prime is 20647171. The reversal of 20647141 is 14174602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18533025 + 2114116 = 4305^2 + 1454^2 .

It is a cyclic number.

It is not a de Polignac number, because 20647141 - 2¹ = 20647139 is a prime.

Together with 20647139, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20647111) 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, 10323570 + 10323571.

It is an arithmetic number, because the mean of its divisors is an integer number (10323571).

Almost surely, 2^20647141 is an apocalyptic number.

It is an amenable number.

20647141 is a deficient number, since it is larger than the sum of its proper divisors (1).

20647141 is an equidigital number, since it uses as much as digits as its factorization.

20647141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 20647141 is about 4543.9125211650. The cubic root of 20647141 is about 274.3384251349.

The spelling of 20647141 in words is "twenty million, six hundred forty-seven thousand, one hundred forty-one".