20444429 has 2 divisors, whose sum is σ = 20444430. Its totient is φ = 20444428.

The previous prime is 20444381. The next prime is 20444471. The reversal of 20444429 is 92444402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20340100 + 104329 = 4510^2 + 323^2 .

It is a cyclic number.

It is not a de Polignac number, because 20444429 - 2²⁰ = 19395853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20444329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10222214 + 10222215.

It is an arithmetic number, because the mean of its divisors is an integer number (10222215).

Almost surely, 2^20444429 is an apocalyptic number.

It is an amenable number.

20444429 is a deficient number, since it is larger than the sum of its proper divisors (1).

20444429 is an equidigital number, since it uses as much as digits as its factorization.

20444429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 20444429 is about 4521.5516142139. The cubic root of 20444429 is about 273.4376597920.

The spelling of 20444429 in words is "twenty million, four hundred forty-four thousand, four hundred twenty-nine".