20718086 has 16 divisors (see below), whose sum is σ = 31758480. Its totient is φ = 10133760.

The previous prime is 20718083. The next prime is 20718091. The reversal of 20718086 is 68081702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20718083) 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, 39506 + ... + 40026.

It is an arithmetic number, because the mean of its divisors is an integer number (1984905).

Almost surely, 2^20718086 is an apocalyptic number.

20718086 is a deficient number, since it is larger than the sum of its proper divisors (11040394).

20718086 is a wasteful number, since it uses less digits than its factorization.

20718086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919.

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 20718086 is about 4551.7124250111. The cubic root of 20718086 is about 274.6522811796.

Adding to 20718086 its reverse (68081702), we get a palindrome (88799788).

The spelling of 20718086 in words is "twenty million, seven hundred eighteen thousand, eighty-six".