20717055 has 12 divisors (see below), whose sum is σ = 35909640. Its totient is φ = 11049072.

The previous prime is 20717041. The next prime is 20717057. The reversal of 20717055 is 55071702.

It is not a de Polignac number, because 20717055 - 2⁵ = 20717023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 230145 + ... + 230234.

It is an arithmetic number, because the mean of its divisors is an integer number (2992470).

Almost surely, 2^20717055 is an apocalyptic number.

20717055 is a deficient number, since it is larger than the sum of its proper divisors (15192585).

20717055 is a wasteful number, since it uses less digits than its factorization.

20717055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460390 (or 460387 counting only the distinct ones).

The product of its (nonzero) digits is 2450, while the sum is 27.

The square root of 20717055 is about 4551.5991695227. The cubic root of 20717055 is about 274.6477252376.

Adding to 20717055 its reverse (55071702), we get a palindrome (75788757).

The spelling of 20717055 in words is "twenty million, seven hundred seventeen thousand, fifty-five".