201820636 has 12 divisors (see below), whose sum is σ = 353558128. Its totient is φ = 100804032.

The previous prime is 201820631. The next prime is 201820637. The reversal of 201820636 is 636028102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201820631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22221 + ... + 29956.

Almost surely, 2^201820636 is an apocalyptic number.

It is an amenable number.

201820636 is a deficient number, since it is larger than the sum of its proper divisors (151737492).

201820636 is a wasteful number, since it uses less digits than its factorization.

201820636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53148 (or 53146 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 201820636 is about 14206.3589987020. The cubic root of 201820636 is about 586.5727140926.

Adding to 201820636 its reverse (636028102), we get a palindrome (837848738).

The spelling of 201820636 in words is "two hundred one million, eight hundred twenty thousand, six hundred thirty-six".