20704089138889 has 4 divisors (see below), whose sum is σ = 22296711380356. Its totient is φ = 19111466897424.

The previous prime is 20704089138869. The next prime is 20704089138907. The reversal of 20704089138889 is 98883198040702.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8049051297225 + 12655037841664 = 2837085^2 + 3557392^2 .

It is a cyclic number.

It is not a de Polignac number, because 20704089138889 - 2²³ = 20704080750281 is a prime.

It is a super-2 number, since 2×20704089138889² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20704089138869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 796311120714 + ... + 796311120739.

It is an arithmetic number, because the mean of its divisors is an integer number (5574177845089).

Almost surely, 2^{20704089138889} is an apocalyptic number.

It is an amenable number.

20704089138889 is a deficient number, since it is larger than the sum of its proper divisors (1592622241467).

20704089138889 is a wasteful number, since it uses less digits than its factorization.

20704089138889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1592622241466.

The product of its (nonzero) digits is 55738368, while the sum is 67.

The spelling of 20704089138889 in words is "twenty trillion, seven hundred four billion, eighty-nine million, one hundred thirty-eight thousand, eight hundred eighty-nine".