20416705 has 4 divisors (see below), whose sum is σ = 24500052. Its totient is φ = 16333360.

The previous prime is 20416703. The next prime is 20416717. The reversal of 20416705 is 50761402.

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 11512449 + 8904256 = 3393^2 + 2984^2 .

It is not a de Polignac number, because 20416705 - 2¹ = 20416703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20416705.

It is not an unprimeable number, because it can be changed into a prime (20416703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2041666 + ... + 2041675.

It is an arithmetic number, because the mean of its divisors is an integer number (6125013).

Almost surely, 2^20416705 is an apocalyptic number.

It is an amenable number.

20416705 is a deficient number, since it is larger than the sum of its proper divisors (4083347).

20416705 is an equidigital number, since it uses as much as digits as its factorization.

20416705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4083346.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20416705 is about 4518.4848124122. The cubic root of 20416705 is about 273.3140040201.

The spelling of 20416705 in words is "twenty million, four hundred sixteen thousand, seven hundred five".