20730571 has 2 divisors, whose sum is σ = 20730572. Its totient is φ = 20730570.

The previous prime is 20730569. The next prime is 20730587. The reversal of 20730571 is 17503702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20730571 - 2¹ = 20730569 is a prime.

Together with 20730569, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20730551) 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, 10365285 + 10365286.

It is an arithmetic number, because the mean of its divisors is an integer number (10365286).

Almost surely, 2^20730571 is an apocalyptic number.

20730571 is a deficient number, since it is larger than the sum of its proper divisors (1).

20730571 is an equidigital number, since it uses as much as digits as its factorization.

20730571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 20730571 is about 4553.0836803204. The cubic root of 20730571 is about 274.7074398329.

The spelling of 20730571 in words is "twenty million, seven hundred thirty thousand, five hundred seventy-one".