20144209 has 2 divisors, whose sum is σ = 20144210. Its totient is φ = 20144208.

The previous prime is 20144143. The next prime is 20144219. The reversal of 20144209 is 90244102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18105025 + 2039184 = 4255^2 + 1428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20144209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20144209.

It is not a weakly prime, because it can be changed into another prime (20144219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10072104 + 10072105.

It is an arithmetic number, because the mean of its divisors is an integer number (10072105).

Almost surely, 2^20144209 is an apocalyptic number.

It is an amenable number.

20144209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20144209 is an equidigital number, since it uses as much as digits as its factorization.

20144209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 20144209 is about 4488.2300520361. The cubic root of 20144209 is about 272.0926056145.

The spelling of 20144209 in words is "twenty million, one hundred forty-four thousand, two hundred nine".