200181820 has 12 divisors (see below), whose sum is σ = 420381864. Its totient is φ = 80072720.

The previous prime is 200181799. The next prime is 200181833. The reversal of 200181820 is 28181002.

It is a super-2 number, since 2×200181820² = 80145522117024800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 200181791 and 200181800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5004526 + ... + 5004565.

It is an arithmetic number, because the mean of its divisors is an integer number (35031822).

Almost surely, 2^200181820 is an apocalyptic number.

200181820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

200181820 is an abundant number, since it is smaller than the sum of its proper divisors (220200044).

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

200181820 is a wasteful number, since it uses less digits than its factorization.

200181820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10009100 (or 10009098 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 200181820 is about 14148.5624711488. The cubic root of 200181820 is about 584.9807089360.

The spelling of 200181820 in words is "two hundred million, one hundred eighty-one thousand, eight hundred twenty".