20730188 has 12 divisors (see below), whose sum is σ = 36323112. Its totient is φ = 10352160.

The previous prime is 20730187. The next prime is 20730217. The reversal of 20730188 is 88103702.

It is a self number, because there is not a number n which added to its sum of digits gives 20730188.

It is not an unprimeable number, because it can be changed into a prime (20730187) 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 3 ways as a sum of consecutive naturals, for example, 983 + ... + 6513.

It is an arithmetic number, because the mean of its divisors is an integer number (3026926).

Almost surely, 2^20730188 is an apocalyptic number.

It is an amenable number.

20730188 is a deficient number, since it is larger than the sum of its proper divisors (15592924).

20730188 is a wasteful number, since it uses less digits than its factorization.

20730188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6472 (or 6470 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 20730188 is about 4553.0416207191. The cubic root of 20730188 is about 274.7057480706.

The spelling of 20730188 in words is "twenty million, seven hundred thirty thousand, one hundred eighty-eight".