20115439 has 2 divisors, whose sum is σ = 20115440. Its totient is φ = 20115438.

The previous prime is 20115413. The next prime is 20115449. The reversal of 20115439 is 93451102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20115439 - 2¹¹ = 20113391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20115449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10057719 + 10057720.

It is an arithmetic number, because the mean of its divisors is an integer number (10057720).

Almost surely, 2^20115439 is an apocalyptic number.

20115439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20115439 is an equidigital number, since it uses as much as digits as its factorization.

20115439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 20115439 is about 4485.0238572387. The cubic root of 20115439 is about 271.9630094954.

The spelling of 20115439 in words is "twenty million, one hundred fifteen thousand, four hundred thirty-nine".