199198020 has 144 divisors (see below), whose sum is σ = 653546880. Its totient is φ = 44402688.

The previous prime is 199198019. The next prime is 199198037. The reversal of 199198020 is 20891991.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 199198020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2238136 + ... + 2238224.

It is an arithmetic number, because the mean of its divisors is an integer number (4538520).

Almost surely, 2^199198020 is an apocalyptic number.

199198020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 199198020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326773440).

199198020 is an abundant number, since it is smaller than the sum of its proper divisors (454348860).

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

199198020 is a wasteful number, since it uses less digits than its factorization.

199198020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 199198020 is about 14113.7528673277. The cubic root of 199198020 is about 584.0208325902.

The spelling of 199198020 in words is "one hundred ninety-nine million, one hundred ninety-eight thousand, twenty".