20424247 has 2 divisors, whose sum is σ = 20424248. Its totient is φ = 20424246.

The previous prime is 20424199. The next prime is 20424263. The reversal of 20424247 is 74242402.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20424247 - 2¹⁵ = 20391479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20424277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212123 + 10212124.

It is an arithmetic number, because the mean of its divisors is an integer number (10212124).

Almost surely, 2^20424247 is an apocalyptic number.

20424247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20424247 is an equidigital number, since it uses as much as digits as its factorization.

20424247 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 25.

The square root of 20424247 is about 4519.3193071524. The cubic root of 20424247 is about 273.3476542500.

Adding to 20424247 its reverse (74242402), we get a palindrome (94666649).

The spelling of 20424247 in words is "twenty million, four hundred twenty-four thousand, two hundred forty-seven".