201820386 has 8 divisors (see below), whose sum is σ = 403640784. Its totient is φ = 67273460.

The previous prime is 201820369. The next prime is 201820387. The reversal of 201820386 is 683028102.

It is a sphenic number, since it is the product of 3 distinct primes.

201820386 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (201820387) 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, 16818360 + ... + 16818371.

It is an arithmetic number, because the mean of its divisors is an integer number (50455098).

Almost surely, 2^201820386 is an apocalyptic number.

201820386 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

201820386 is a wasteful number, since it uses less digits than its factorization.

201820386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33636736.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 201820386 is about 14206.3501998226. The cubic root of 201820386 is about 586.5724718920.

Adding to 201820386 its reverse (683028102), we get a palindrome (884848488).

The spelling of 201820386 in words is "two hundred one million, eight hundred twenty thousand, three hundred eighty-six".