20841229 has 2 divisors, whose sum is σ = 20841230. Its totient is φ = 20841228.

The previous prime is 20841211. The next prime is 20841239. The reversal of 20841229 is 92214802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15444900 + 5396329 = 3930^2 + 2323^2 .

It is a cyclic number.

It is not a de Polignac number, because 20841229 - 2⁹ = 20840717 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 20841197 and 20841206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20841239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10420614 + 10420615.

It is an arithmetic number, because the mean of its divisors is an integer number (10420615).

Almost surely, 2^20841229 is an apocalyptic number.

It is an amenable number.

20841229 is a deficient number, since it is larger than the sum of its proper divisors (1).

20841229 is an equidigital number, since it uses as much as digits as its factorization.

20841229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20841229 is about 4565.2194908898. The cubic root of 20841229 is about 275.1953609066.

The spelling of 20841229 in words is "twenty million, eight hundred forty-one thousand, two hundred twenty-nine".