20704705 has 12 divisors (see below), whose sum is σ = 28902420. Its totient is φ = 14197344.

The previous prime is 20704703. The next prime is 20704709. The reversal of 20704705 is 50740702.

It can be written as a sum of positive squares in 2 ways, for example, as 10870209 + 9834496 = 3297^2 + 3136^2 .

It is not a de Polignac number, because 20704705 - 2¹ = 20704703 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20704705.

It is not an unprimeable number, because it can be changed into a prime (20704703) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42010 + ... + 42499.

It is an arithmetic number, because the mean of its divisors is an integer number (2408535).

Almost surely, 2^20704705 is an apocalyptic number.

It is an amenable number.

20704705 is a deficient number, since it is larger than the sum of its proper divisors (8197715).

20704705 is an equidigital number, since it uses as much as digits as its factorization.

20704705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84528 (or 84521 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 25.

The square root of 20704705 is about 4550.2423012407. The cubic root of 20704705 is about 274.5931393962.

The spelling of 20704705 in words is "twenty million, seven hundred four thousand, seven hundred five".