20479705 has 8 divisors (see below), whose sum is σ = 25175304. Its totient is φ = 15984000.

The previous prime is 20479703. The next prime is 20479709. The reversal of 20479705 is 50797402.

It can be written as a sum of positive squares in 4 ways, for example, as 2408704 + 18071001 = 1552^2 + 4251^2 .

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

It is not a de Polignac number, because 20479705 - 2¹ = 20479703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20479703) 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, 49746 + ... + 50155.

It is an arithmetic number, because the mean of its divisors is an integer number (3146913).

Almost surely, 2^20479705 is an apocalyptic number.

It is an amenable number.

20479705 is a deficient number, since it is larger than the sum of its proper divisors (4695599).

20479705 is an equidigital number, since it uses as much as digits as its factorization.

20479705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99947.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 20479705 is about 4525.4508062733. The cubic root of 20479705 is about 273.5948378086.

The spelling of 20479705 in words is "twenty million, four hundred seventy-nine thousand, seven hundred five".