20717086 has 16 divisors (see below), whose sum is σ = 33542208. Its totient is φ = 9540000.

The previous prime is 20717063. The next prime is 20717093. The reversal of 20717086 is 68071702.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18996 + ... + 20056.

It is an arithmetic number, because the mean of its divisors is an integer number (2096388).

Almost surely, 2^20717086 is an apocalyptic number.

20717086 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

20717086 is a deficient number, since it is larger than the sum of its proper divisors (12825122).

20717086 is a wasteful number, since it uses less digits than its factorization.

20717086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 20717086 is about 4551.6025749180. The cubic root of 20717086 is about 274.6478622274.

Adding to 20717086 its reverse (68071702), we get a palindrome (88788788).

The spelling of 20717086 in words is "twenty million, seven hundred seventeen thousand, eighty-six".