20670943 has 2 divisors, whose sum is σ = 20670944. Its totient is φ = 20670942.

The previous prime is 20670941. The next prime is 20670959. The reversal of 20670943 is 34907602.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20670943 - 2¹ = 20670941 is a prime.

Together with 20670941, 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 (20670941) 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, 10335471 + 10335472.

It is an arithmetic number, because the mean of its divisors is an integer number (10335472).

Almost surely, 2^20670943 is an apocalyptic number.

20670943 is a deficient number, since it is larger than the sum of its proper divisors (1).

20670943 is an equidigital number, since it uses as much as digits as its factorization.

20670943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 20670943 is about 4546.5308752938. The cubic root of 20670943 is about 274.4438036571.

The spelling of 20670943 in words is "twenty million, six hundred seventy thousand, nine hundred forty-three".