20712186 has 80 divisors (see below), whose sum is σ = 51749280. Its totient is φ = 6138720.

The previous prime is 20712163. The next prime is 20712187. The reversal of 20712186 is 68121702.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20712187) 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 39 ways as a sum of consecutive naturals, for example, 105040 + ... + 105236.

It is an arithmetic number, because the mean of its divisors is an integer number (646866).

Almost surely, 2^20712186 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20712186, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25874640).

20712186 is an abundant number, since it is smaller than the sum of its proper divisors (31037094).

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

20712186 is a wasteful number, since it uses less digits than its factorization.

20712186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 20712186 is about 4551.0642711348. The cubic root of 20712186 is about 274.6262073054.

Adding to 20712186 its reverse (68121702), we get a palindrome (88833888).

The spelling of 20712186 in words is "twenty million, seven hundred twelve thousand, one hundred eighty-six".