20186928 has 80 divisors (see below), whose sum is σ = 58746240. Its totient is φ = 6636096.

The previous prime is 20186927. The next prime is 20186951. The reversal of 20186928 is 82968102.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20186892 and 20186901.

It is not an unprimeable number, because it can be changed into a prime (20186927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35575 + ... + 36137.

It is an arithmetic number, because the mean of its divisors is an integer number (734328).

Almost surely, 2^20186928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20186928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29373120).

20186928 is an abundant number, since it is smaller than the sum of its proper divisors (38559312).

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

20186928 is a wasteful number, since it uses less digits than its factorization.

20186928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 20186928 is about 4492.9865345892. The cubic root of 20186928 is about 272.2848083658.

The spelling of 20186928 in words is "twenty million, one hundred eighty-six thousand, nine hundred twenty-eight".