20667011 has 2 divisors, whose sum is σ = 20667012. Its totient is φ = 20667010.

The previous prime is 20666999. The next prime is 20667013. The reversal of 20667011 is 11076602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20667011 - 2¹⁰ = 20665987 is a prime.

Together with 20667013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20667013) 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, 10333505 + 10333506.

It is an arithmetic number, because the mean of its divisors is an integer number (10333506).

Almost surely, 2^20667011 is an apocalyptic number.

20667011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20667011 is an equidigital number, since it uses as much as digits as its factorization.

20667011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 20667011 is about 4546.0984371217. The cubic root of 20667011 is about 274.4264011054.

The spelling of 20667011 in words is "twenty million, six hundred sixty-seven thousand, eleven".