20186838 has 48 divisors (see below), whose sum is σ = 50409216. Its totient is φ = 5718960.

The previous prime is 20186827. The next prime is 20186839. The reversal of 20186838 is 83868102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20186839) 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 in 23 ways as a sum of consecutive naturals, for example, 15895 + ... + 17117.

It is an arithmetic number, because the mean of its divisors is an integer number (1050192).

Almost surely, 2^20186838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20186838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25204608).

20186838 is an abundant number, since it is smaller than the sum of its proper divisors (30222378).

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

20186838 is a wasteful number, since it uses less digits than its factorization.

20186838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1369 (or 1366 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 20186838 is about 4492.9765189682. The cubic root of 20186838 is about 272.2844037199.

The spelling of 20186838 in words is "twenty million, one hundred eighty-six thousand, eight hundred thirty-eight".