20004239 has 2 divisors, whose sum is σ = 20004240. Its totient is φ = 20004238.

The previous prime is 20004233. The next prime is 20004253. The reversal of 20004239 is 93240002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20004239 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20004239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20004233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002119 + 10002120.

It is an arithmetic number, because the mean of its divisors is an integer number (10002120).

Almost surely, 2^20004239 is an apocalyptic number.

20004239 is a deficient number, since it is larger than the sum of its proper divisors (1).

20004239 is an equidigital number, since it uses as much as digits as its factorization.

20004239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 20004239 is about 4472.6098644975. The cubic root of 20004239 is about 271.4609376652.

The spelling of 20004239 in words is "twenty million, four thousand, two hundred thirty-nine".