200020191 has 16 divisors (see below), whose sum is σ = 304992000. Its totient is φ = 114222528.

The previous prime is 200020189. The next prime is 200020199. The reversal of 200020191 is 191020002.

It is a happy number.

It is not a de Polignac number, because 200020191 - 2¹ = 200020189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 200020191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200020199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54915 + ... + 58443.

It is an arithmetic number, because the mean of its divisors is an integer number (19062000).

Almost surely, 2^200020191 is an apocalyptic number.

200020191 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

200020191 is a deficient number, since it is larger than the sum of its proper divisors (104971809).

200020191 is a wasteful number, since it uses less digits than its factorization.

200020191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6238.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 200020191 is about 14142.8494653659. The cubic root of 200020191 is about 584.8232265944.

Adding to 200020191 its reverse (191020002), we get a palindrome (391040193).

The spelling of 200020191 in words is "two hundred million, twenty thousand, one hundred ninety-one".