20843122705 has 8 divisors (see below), whose sum is σ = 25071160104. Its totient is φ = 16634889600.

The previous prime is 20843122679. The next prime is 20843122709. The reversal of 20843122705 is 50722134802.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1661703696 + 19181419009 = 40764^2 + 138497^2 .

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

It is not a de Polignac number, because 20843122705 - 2¹⁷ = 20842991633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20843122709) 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, 4948756 + ... + 4952965.

It is an arithmetic number, because the mean of its divisors is an integer number (3133895013).

Almost surely, 2^20843122705 is an apocalyptic number.

It is an amenable number.

20843122705 is a deficient number, since it is larger than the sum of its proper divisors (4228037399).

20843122705 is an equidigital number, since it uses as much as digits as its factorization.

20843122705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9902147.

The product of its (nonzero) digits is 26880, while the sum is 34.

The spelling of 20843122705 in words is "twenty billion, eight hundred forty-three million, one hundred twenty-two thousand, seven hundred five".