19803940 has 48 divisors (see below), whose sum is σ = 45581760. Its totient is φ = 7182720.

The previous prime is 19803937. The next prime is 19803983. The reversal of 19803940 is 4930891.

It is a junction number, because it is equal to n+sod(n) for n = 19803896 and 19803905.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14695 + ... + 15985.

It is an arithmetic number, because the mean of its divisors is an integer number (949620).

Almost surely, 2^19803940 is an apocalyptic number.

19803940 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 19803940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22790880).

19803940 is an abundant number, since it is smaller than the sum of its proper divisors (25777820).

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

19803940 is a wasteful number, since it uses less digits than its factorization.

19803940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372 (or 1370 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 19803940 is about 4450.1617948115. The cubic root of 19803940 is about 270.5518662154.

The spelling of 19803940 in words is "nineteen million, eight hundred three thousand, nine hundred forty".