20307071 has 2 divisors, whose sum is σ = 20307072. Its totient is φ = 20307070.

The previous prime is 20307059. The next prime is 20307103. The reversal of 20307071 is 17070302.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20307071 is a prime.

It is a Sophie Germain 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 (20307271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10153535 + 10153536.

It is an arithmetic number, because the mean of its divisors is an integer number (10153536).

Almost surely, 2^20307071 is an apocalyptic number.

20307071 is a deficient number, since it is larger than the sum of its proper divisors (1).

20307071 is an equidigital number, since it uses as much as digits as its factorization.

20307071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 294, while the sum is 20.

The square root of 20307071 is about 4506.3367606072. The cubic root of 20307071 is about 272.8239102015.

Adding to 20307071 its reverse (17070302), we get a palindrome (37377373).

The spelling of 20307071 in words is "twenty million, three hundred seven thousand, seventy-one".