20967109 has 2 divisors, whose sum is σ = 20967110. Its totient is φ = 20967108.

The previous prime is 20967091. The next prime is 20967139. The reversal of 20967109 is 90176902.

Together with previous prime (20967091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20958084 + 9025 = 4578^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 20967109 - 2⁹ = 20966597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20967139) 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, 10483554 + 10483555.

It is an arithmetic number, because the mean of its divisors is an integer number (10483555).

Almost surely, 2^20967109 is an apocalyptic number.

It is an amenable number.

20967109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20967109 is an equidigital number, since it uses as much as digits as its factorization.

20967109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 20967109 is about 4578.9855863499. The cubic root of 20967109 is about 275.7483046352.

The spelling of 20967109 in words is "twenty million, nine hundred sixty-seven thousand, one hundred nine".