18821080 has 32 divisors (see below), whose sum is σ = 42865200. Its totient is φ = 7436416.

The previous prime is 18821071. The next prime is 18821083. The reversal of 18821080 is 8012881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18821083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486 + ... + 6154.

Almost surely, 2^18821080 is an apocalyptic number.

18821080 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 18821080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21432600).

18821080 is an abundant number, since it is smaller than the sum of its proper divisors (24044120).

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

18821080 is a wasteful number, since it uses less digits than its factorization.

18821080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5763 (or 5759 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 18821080 is about 4338.3268664313. The cubic root of 18821080 is about 265.9999246236. Note that the first 4 decimals are identical.

The spelling of 18821080 in words is "eighteen million, eight hundred twenty-one thousand, eighty".