20186872 has 8 divisors (see below), whose sum is σ = 37850400. Its totient is φ = 10093432.

The previous prime is 20186857. The next prime is 20186879. The reversal of 20186872 is 27868102.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×20186872² = 815019602288768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20186879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1261672 + ... + 1261687.

It is an arithmetic number, because the mean of its divisors is an integer number (4731300).

Almost surely, 2^20186872 is an apocalyptic number.

It is an amenable number.

20186872 is a deficient number, since it is larger than the sum of its proper divisors (17663528).

20186872 is a wasteful number, since it uses less digits than its factorization.

20186872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2523365 (or 2523361 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 20186872 is about 4492.9803026499. The cubic root of 20186872 is about 272.2845565863.

The spelling of 20186872 in words is "twenty million, one hundred eighty-six thousand, eight hundred seventy-two".