20707439 has 2 divisors, whose sum is σ = 20707440. Its totient is φ = 20707438.

The previous prime is 20707433. The next prime is 20707441. The reversal of 20707439 is 93470702.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20707439 - 2¹² = 20703343 is a prime.

Together with 20707441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20707433) 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, 10353719 + 10353720.

It is an arithmetic number, because the mean of its divisors is an integer number (10353720).

Almost surely, 2^20707439 is an apocalyptic number.

20707439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20707439 is an equidigital number, since it uses as much as digits as its factorization.

20707439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 20707439 is about 4550.5427148858. The cubic root of 20707439 is about 274.6052252901.

The spelling of 20707439 in words is "twenty million, seven hundred seven thousand, four hundred thirty-nine".