20127109 has 2 divisors, whose sum is σ = 20127110. Its totient is φ = 20127108.

The previous prime is 20127043. The next prime is 20127113. The reversal of 20127109 is 90172102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18105025 + 2022084 = 4255^2 + 1422^2 .

It is a cyclic number.

It is not a de Polignac number, because 20127109 - 2⁹ = 20126597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20127109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20127119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10063554 + 10063555.

It is an arithmetic number, because the mean of its divisors is an integer number (10063555).

Almost surely, 2^20127109 is an apocalyptic number.

It is an amenable number.

20127109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20127109 is an equidigital number, since it uses as much as digits as its factorization.

20127109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 20127109 is about 4486.3246650237. The cubic root of 20127109 is about 272.0155925678.

The spelling of 20127109 in words is "twenty million, one hundred twenty-seven thousand, one hundred nine".