20444471 has 2 divisors, whose sum is σ = 20444472. Its totient is φ = 20444470.

The previous prime is 20444429. The next prime is 20444491. The reversal of 20444471 is 17444402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20444471 is a prime.

It is a super-3 number, since 3×20444471³ (a number of 23 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20444471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20444491) 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, 10222235 + 10222236.

It is an arithmetic number, because the mean of its divisors is an integer number (10222236).

Almost surely, 2^20444471 is an apocalyptic number.

20444471 is a deficient number, since it is larger than the sum of its proper divisors (1).

20444471 is an equidigital number, since it uses as much as digits as its factorization.

20444471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 26.

The square root of 20444471 is about 4521.5562586349. The cubic root of 20444471 is about 273.4378470374.

Adding to 20444471 its reverse (17444402), we get a palindrome (37888873).

The spelling of 20444471 in words is "twenty million, four hundred forty-four thousand, four hundred seventy-one".