20442439 has 2 divisors, whose sum is σ = 20442440. Its totient is φ = 20442438.

The previous prime is 20442427. The next prime is 20442451. The reversal of 20442439 is 93424402.

It is a balanced prime because it is at equal distance from previous prime (20442427) and next prime (20442451).

It is a cyclic number.

It is not a de Polignac number, because 20442439 - 2¹³ = 20434247 is a 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 (20442479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221219 + 10221220.

It is an arithmetic number, because the mean of its divisors is an integer number (10221220).

Almost surely, 2^20442439 is an apocalyptic number.

20442439 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442439 is an equidigital number, since it uses as much as digits as its factorization.

20442439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 20442439 is about 4521.3315516560. The cubic root of 20442439 is about 273.4287876342.

The spelling of 20442439 in words is "twenty million, four hundred forty-two thousand, four hundred thirty-nine".