20077439 has 2 divisors, whose sum is σ = 20077440. Its totient is φ = 20077438.

The previous prime is 20077427. The next prime is 20077489. The reversal of 20077439 is 93477002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20077439 - 2⁴ = 20077423 is a prime.

It is a Chen prime.

It is a plaindrome in base 8.

It is a zygodrome in base 8.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20077489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10038719 + 10038720.

It is an arithmetic number, because the mean of its divisors is an integer number (10038720).

Almost surely, 2^20077439 is an apocalyptic number.

20077439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20077439 is an equidigital number, since it uses as much as digits as its factorization.

20077439 is an evil number, because the sum of its binary digits is even.

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

The square root of 20077439 is about 4480.7855338099. The cubic root of 20077439 is about 271.7916467778.

The spelling of 20077439 in words is "twenty million, seventy-seven thousand, four hundred thirty-nine".