20207839 has 2 divisors, whose sum is σ = 20207840. Its totient is φ = 20207838.

The previous prime is 20207833. The next prime is 20207843. The reversal of 20207839 is 93870202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20207839 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 20207839.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20207833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10103919 + 10103920.

It is an arithmetic number, because the mean of its divisors is an integer number (10103920).

Almost surely, 2^20207839 is an apocalyptic number.

20207839 is a deficient number, since it is larger than the sum of its proper divisors (1).

20207839 is an equidigital number, since it uses as much as digits as its factorization.

20207839 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20207839 is about 4495.3130035627. The cubic root of 20207839 is about 272.3787929940.

The spelling of 20207839 in words is "twenty million, two hundred seven thousand, eight hundred thirty-nine".