20441639 has 2 divisors, whose sum is σ = 20441640. Its totient is φ = 20441638.

The previous prime is 20441627. The next prime is 20441651. The reversal of 20441639 is 93614402.

It is a balanced prime because it is at equal distance from previous prime (20441627) and next prime (20441651).

It is a cyclic number.

It is not a de Polignac number, because 20441639 - 2²⁰ = 19393063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20441669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10220819 + 10220820.

It is an arithmetic number, because the mean of its divisors is an integer number (10220820).

Almost surely, 2^20441639 is an apocalyptic number.

20441639 is a deficient number, since it is larger than the sum of its proper divisors (1).

20441639 is an equidigital number, since it uses as much as digits as its factorization.

20441639 is an odious number, because the sum of its binary digits is odd.

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

The square root of 20441639 is about 4521.2430812775. The cubic root of 20441639 is about 273.4252207754.

The spelling of 20441639 in words is "twenty million, four hundred forty-one thousand, six hundred thirty-nine".