20380439 has 2 divisors, whose sum is σ = 20380440. Its totient is φ = 20380438.

The previous prime is 20380427. The next prime is 20380453. The reversal of 20380439 is 93408302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20380439 - 2²⁰ = 19331863 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20380489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10190219 + 10190220.

It is an arithmetic number, because the mean of its divisors is an integer number (10190220).

Almost surely, 2^20380439 is an apocalyptic number.

20380439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20380439 is an equidigital number, since it uses as much as digits as its factorization.

20380439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20380439 is about 4514.4699578134. The cubic root of 20380439 is about 273.1520797472.

The spelling of 20380439 in words is "twenty million, three hundred eighty thousand, four hundred thirty-nine".