19801843200 has 600 divisors, whose sum is σ = 74596587120. Its totient is φ = 5186764800.

The previous prime is 19801843177. The next prime is 19801843223. The reversal of 19801843200 is 234810891.

It is an interprime number because it is at equal distance from previous prime (19801843177) and next prime (19801843223).

It is a tau number, because it is divible by the number of its divisors (600).

It is a super-2 number, since 2×19801843200² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 73612666 + ... + 73612934.

Almost surely, 2^19801843200 is an apocalyptic number.

19801843200 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 19801843200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37298293560).

19801843200 is an abundant number, since it is smaller than the sum of its proper divisors (54794743920).

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

19801843200 is an equidigital number, since it uses as much as digits as its factorization.

19801843200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 19801843200 in words is "nineteen billion, eight hundred one million, eight hundred forty-three thousand, two hundred".