20717166 has 16 divisors (see below), whose sum is σ = 41549904. Its totient is φ = 6886464.

The previous prime is 20717159. The next prime is 20717167. The reversal of 20717166 is 66171702.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20717167) 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, 2391 + ... + 6866.

It is an arithmetic number, because the mean of its divisors is an integer number (2596869).

Almost surely, 2^20717166 is an apocalyptic number.

20717166 is an abundant number, since it is smaller than the sum of its proper divisors (20832738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20717166 is a wasteful number, since it uses less digits than its factorization.

20717166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9635.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 20717166 is about 4551.6113630230. The cubic root of 20717166 is about 274.6482157488.

Adding to 20717166 its reverse (66171702), we get a palindrome (86888868).

The spelling of 20717166 in words is "twenty million, seven hundred seventeen thousand, one hundred sixty-six".