20671307 has 2 divisors, whose sum is σ = 20671308. Its totient is φ = 20671306.

The previous prime is 20671289. The next prime is 20671331. The reversal of 20671307 is 70317602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20671307 - 2¹² = 20667211 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20671397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10335653 + 10335654.

It is an arithmetic number, because the mean of its divisors is an integer number (10335654).

Almost surely, 2^20671307 is an apocalyptic number.

20671307 is a deficient number, since it is larger than the sum of its proper divisors (1).

20671307 is an equidigital number, since it uses as much as digits as its factorization.

20671307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 20671307 is about 4546.5709056387. The cubic root of 20671307 is about 274.4454145650.

Adding to 20671307 its reverse (70317602), we get a palindrome (90988909).

The spelling of 20671307 in words is "twenty million, six hundred seventy-one thousand, three hundred seven".