20427247 has 2 divisors, whose sum is σ = 20427248. Its totient is φ = 20427246.

The previous prime is 20427241. The next prime is 20427257. The reversal of 20427247 is 74272402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20427247 - 2⁷ = 20427119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20427241) 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, 10213623 + 10213624.

It is an arithmetic number, because the mean of its divisors is an integer number (10213624).

Almost surely, 2^20427247 is an apocalyptic number.

20427247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20427247 is an equidigital number, since it uses as much as digits as its factorization.

20427247 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 28.

The square root of 20427247 is about 4519.6512033563. The cubic root of 20427247 is about 273.3610370823.

Adding to 20427247 its reverse (74272402), we get a palindrome (94699649).

The spelling of 20427247 in words is "twenty million, four hundred twenty-seven thousand, two hundred forty-seven".