200001820 has 24 divisors (see below), whose sum is σ = 421687728. Its totient is φ = 79680000.

The previous prime is 200001797. The next prime is 200001827. The reversal of 200001820 is 28100002.

200001820 is a modest number, since divided by 1820 gives 200 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 200001820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200001827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14901 + ... + 24940.

It is an arithmetic number, because the mean of its divisors is an integer number (17570322).

Almost surely, 2^200001820 is an apocalyptic number.

200001820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

200001820 is an abundant number, since it is smaller than the sum of its proper divisors (221685908).

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

200001820 is a wasteful number, since it uses less digits than its factorization.

200001820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40101 (or 40099 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 200001820 is about 14142.1999703017. The cubic root of 200001820 is about 584.8053215413.

Adding to 200001820 its reverse (28100002), we get a palindrome (228101822).

The spelling of 200001820 in words is "two hundred million, one thousand, eight hundred twenty".