19998030 has 64 divisors (see below), whose sum is σ = 52835328. Its totient is φ = 4813440.

The previous prime is 19998029. The next prime is 19998031. The reversal of 19998030 is 3089991.

It is an interprime number because it is at equal distance from previous prime (19998029) and next prime (19998031).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 19998030.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17785 + ... + 18875.

It is an arithmetic number, because the mean of its divisors is an integer number (825552).

Almost surely, 2^19998030 is an apocalyptic number.

19998030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19998030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26417664).

19998030 is an abundant number, since it is smaller than the sum of its proper divisors (32837298).

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

19998030 is a wasteful number, since it uses less digits than its factorization.

19998030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1161.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 19998030 is about 4471.9156968798. The cubic root of 19998030 is about 271.4328490290.

The spelling of 19998030 in words is "nineteen million, nine hundred ninety-eight thousand, thirty".