20244247 has 2 divisors, whose sum is σ = 20244248. Its totient is φ = 20244246.

The previous prime is 20244239. The next prime is 20244269. The reversal of 20244247 is 74244202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20244247 - 2³ = 20244239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20244277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10122123 + 10122124.

It is an arithmetic number, because the mean of its divisors is an integer number (10122124).

Almost surely, 2^20244247 is an apocalyptic number.

20244247 is a deficient number, since it is larger than the sum of its proper divisors (1).

20244247 is an equidigital number, since it uses as much as digits as its factorization.

20244247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 25.

The square root of 20244247 is about 4499.3607323708. The cubic root of 20244247 is about 272.5422743942.

Adding to 20244247 its reverse (74244202), we get a palindrome (94488449).

The spelling of 20244247 in words is "twenty million, two hundred forty-four thousand, two hundred forty-seven".