20244239 has 2 divisors, whose sum is σ = 20244240. Its totient is φ = 20244238.

The previous prime is 20244199. The next prime is 20244247. The reversal of 20244239 is 93244202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20244239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20244269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10122119 + 10122120.

It is an arithmetic number, because the mean of its divisors is an integer number (10122120).

Almost surely, 2^20244239 is an apocalyptic number.

20244239 is a deficient number, since it is larger than the sum of its proper divisors (1).

20244239 is an equidigital number, since it uses as much as digits as its factorization.

20244239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20244239 is about 4499.3598433555. The cubic root of 20244239 is about 272.5422384936.

The spelling of 20244239 in words is "twenty million, two hundred forty-four thousand, two hundred thirty-nine".