20417447 has 2 divisors, whose sum is σ = 20417448. Its totient is φ = 20417446.

The previous prime is 20417429. The next prime is 20417473. The reversal of 20417447 is 74471402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20417447 - 2¹⁴ = 20401063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20417417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10208723 + 10208724.

It is an arithmetic number, because the mean of its divisors is an integer number (10208724).

Almost surely, 2^20417447 is an apocalyptic number.

20417447 is a deficient number, since it is larger than the sum of its proper divisors (1).

20417447 is an equidigital number, since it uses as much as digits as its factorization.

20417447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 29.

The square root of 20417447 is about 4518.5669188361. The cubic root of 20417447 is about 273.3173149777.

Adding to 20417447 its reverse (74471402), we get a palindrome (94888849).

The spelling of 20417447 in words is "twenty million, four hundred seventeen thousand, four hundred forty-seven".