20644316439 has 8 divisors (see below), whose sum is σ = 27544247280. Its totient is φ = 13753631616.

The previous prime is 20644316431. The next prime is 20644316447. The reversal of 20644316439 is 93461344602.

It is an interprime number because it is at equal distance from previous prime (20644316431) and next prime (20644316447).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20644316439 - 2³ = 20644316431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20644316439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20644316431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2306292 + ... + 2315225.

It is an arithmetic number, because the mean of its divisors is an integer number (3443030910).

Almost surely, 2^20644316439 is an apocalyptic number.

20644316439 is a deficient number, since it is larger than the sum of its proper divisors (6899930841).

20644316439 is a wasteful number, since it uses less digits than its factorization.

20644316439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4623009.

The product of its (nonzero) digits is 373248, while the sum is 42.

The spelling of 20644316439 in words is "twenty billion, six hundred forty-four million, three hundred sixteen thousand, four hundred thirty-nine".