19808982 has 64 divisors (see below), whose sum is σ = 47520000. Its totient is φ = 6096384.

The previous prime is 19808981. The next prime is 19808989. The reversal of 19808982 is 28980891.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19808981) 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, 43894 + ... + 44342.

It is an arithmetic number, because the mean of its divisors is an integer number (742500).

Almost surely, 2^19808982 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19808982, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23760000).

19808982 is an abundant number, since it is smaller than the sum of its proper divisors (27711018).

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

19808982 is a wasteful number, since it uses less digits than its factorization.

19808982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 516 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 19808982 is about 4450.7282550163. The cubic root of 19808982 is about 270.5748247236.

The spelling of 19808982 in words is "nineteen million, eight hundred eight thousand, nine hundred eighty-two".