19905030 has 48 divisors (see below), whose sum is σ = 52541424. Its totient is φ = 5227200.

The previous prime is 19905023. The next prime is 19905031. The reversal of 19905030 is 3050991.

It is a junction number, because it is equal to n+sod(n) for n = 19904985 and 19905003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19905031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4380 + ... + 7680.

It is an arithmetic number, because the mean of its divisors is an integer number (1094613).

Almost surely, 2^19905030 is an apocalyptic number.

19905030 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 19905030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26270712).

19905030 is an abundant number, since it is smaller than the sum of its proper divisors (32636394).

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

19905030 is a wasteful number, since it uses less digits than its factorization.

19905030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3381 (or 3378 counting only the distinct ones).

The product of its (nonzero) digits is 1215, while the sum is 27.

The square root of 19905030 is about 4461.5053513360. The cubic root of 19905030 is about 271.0114327316.

The spelling of 19905030 in words is "nineteen million, nine hundred five thousand, thirty".