20344447 has 2 divisors, whose sum is σ = 20344448. Its totient is φ = 20344446.

The previous prime is 20344433. The next prime is 20344453. The reversal of 20344447 is 74444302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20344447 - 2⁷ = 20344319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20344417) 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, 10172223 + 10172224.

It is an arithmetic number, because the mean of its divisors is an integer number (10172224).

Almost surely, 2^20344447 is an apocalyptic number.

20344447 is a deficient number, since it is larger than the sum of its proper divisors (1).

20344447 is an equidigital number, since it uses as much as digits as its factorization.

20344447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 28.

The square root of 20344447 is about 4510.4819033004. The cubic root of 20344447 is about 272.9911888277.

Adding to 20344447 its reverse (74444302), we get a palindrome (94788749).

The spelling of 20344447 in words is "twenty million, three hundred forty-four thousand, four hundred forty-seven".