20716005 has 16 divisors (see below), whose sum is σ = 34289280. Its totient is φ = 10667328.

The previous prime is 20716001. The next prime is 20716037. The reversal of 20716005 is 50061702.

It is not a de Polignac number, because 20716005 - 2² = 20716001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20716001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23377 + ... + 24246.

It is an arithmetic number, because the mean of its divisors is an integer number (2143080).

Almost surely, 2^20716005 is an apocalyptic number.

It is an amenable number.

20716005 is a deficient number, since it is larger than the sum of its proper divisors (13573275).

20716005 is a wasteful number, since it uses less digits than its factorization.

20716005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47660.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 20716005 is about 4551.4838239853. The cubic root of 20716005 is about 274.6430851800.

Adding to 20716005 its reverse (50061702), we get a palindrome (70777707).

The spelling of 20716005 in words is "twenty million, seven hundred sixteen thousand, five".