201143820 has 24 divisors (see below), whose sum is σ = 563202864. Its totient is φ = 53638336.

The previous prime is 201143807. The next prime is 201143837. The reversal of 201143820 is 28341102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1676139 + ... + 1676258.

It is an arithmetic number, because the mean of its divisors is an integer number (23466786).

Almost surely, 2^201143820 is an apocalyptic number.

201143820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201143820 is an abundant number, since it is smaller than the sum of its proper divisors (362059044).

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

201143820 is a wasteful number, since it uses less digits than its factorization.

201143820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3352409 (or 3352407 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 201143820 is about 14182.5181120984. The cubic root of 201143820 is about 585.9162790466.

Adding to 201143820 its reverse (28341102), we get a palindrome (229484922).

The spelling of 201143820 in words is "two hundred one million, one hundred forty-three thousand, eight hundred twenty".