19994380 has 96 divisors (see below), whose sum is σ = 52641792. Its totient is φ = 6220800.

The previous prime is 19994371. The next prime is 19994389. The reversal of 19994380 is 8349991.

It is an interprime number because it is at equal distance from previous prime (19994371) and next prime (19994389).

It is not an unprimeable number, because it can be changed into a prime (19994389) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73645 + ... + 73915.

It is an arithmetic number, because the mean of its divisors is an integer number (548352).

Almost surely, 2^19994380 is an apocalyptic number.

19994380 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 19994380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26320896).

19994380 is an abundant number, since it is smaller than the sum of its proper divisors (32647412).

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

19994380 is a wasteful number, since it uses less digits than its factorization.

19994380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 19994380 is about 4471.5075757512. The cubic root of 19994380 is about 271.4163342326.

The spelling of 19994380 in words is "nineteen million, nine hundred ninety-four thousand, three hundred eighty".