20416247 has 2 divisors, whose sum is σ = 20416248. Its totient is φ = 20416246.

The previous prime is 20416243. The next prime is 20416309. The reversal of 20416247 is 74261402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20416247 - 2² = 20416243 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20416243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10208123 + 10208124.

It is an arithmetic number, because the mean of its divisors is an integer number (10208124).

Almost surely, 2^20416247 is an apocalyptic number.

20416247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20416247 is an equidigital number, since it uses as much as digits as its factorization.

20416247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 20416247 is about 4518.4341314221. The cubic root of 20416247 is about 273.3119602893.

Adding to 20416247 its reverse (74261402), we get a palindrome (94677649).

The spelling of 20416247 in words is "twenty million, four hundred sixteen thousand, two hundred forty-seven".