199618020 has 240 divisors, whose sum is σ = 741565440. Its totient is φ = 43981056.

The previous prime is 199618019. The next prime is 199618031. The reversal of 199618020 is 20816991.

199618020 is a `hidden beast` number, since 19 + 9 + 618 + 0 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 328557 + ... + 329163.

It is an arithmetic number, because the mean of its divisors is an integer number (3089856).

Almost surely, 2^199618020 is an apocalyptic number.

199618020 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 199618020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (370782720).

199618020 is an abundant number, since it is smaller than the sum of its proper divisors (541947420).

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

199618020 is a wasteful number, since it uses less digits than its factorization.

199618020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664 (or 653 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 199618020 is about 14128.6241368365. The cubic root of 199618020 is about 584.4310049368.

The spelling of 199618020 in words is "one hundred ninety-nine million, six hundred eighteen thousand, twenty".