201820236 has 12 divisors (see below), whose sum is σ = 470913912. Its totient is φ = 67273408.

The previous prime is 201820231. The next prime is 201820259. The reversal of 201820236 is 632028102.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (201820231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8409165 + ... + 8409188.

It is an arithmetic number, because the mean of its divisors is an integer number (39242826).

Almost surely, 2^201820236 is an apocalyptic number.

It is an amenable number.

201820236 is an abundant number, since it is smaller than the sum of its proper divisors (269093676).

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

201820236 is a wasteful number, since it uses less digits than its factorization.

201820236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16818360 (or 16818358 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 201820236 is about 14206.3449204924. The cubic root of 201820236 is about 586.5723265715.

Adding to 201820236 its reverse (632028102), we get a palindrome (833848338).

The spelling of 201820236 in words is "two hundred one million, eight hundred twenty thousand, two hundred thirty-six".