19800736 has 48 divisors (see below), whose sum is σ = 42487200. Its totient is φ = 9047808.

The previous prime is 19800731. The next prime is 19800743. The reversal of 19800736 is 63700891.

It is a super-2 number, since 2×19800736² = 784138292283392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19800731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17071 + ... + 18193.

It is an arithmetic number, because the mean of its divisors is an integer number (885150).

Almost surely, 2^19800736 is an apocalyptic number.

19800736 is a gapful number since it is divisible by the number (16) 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 19800736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21243600).

19800736 is an abundant number, since it is smaller than the sum of its proper divisors (22686464).

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

19800736 is a wasteful number, since it uses less digits than its factorization.

19800736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1181 (or 1173 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 19800736 is about 4449.8017933387. The cubic root of 19800736 is about 270.5372749281.

The spelling of 19800736 in words is "nineteen million, eight hundred thousand, seven hundred thirty-six".