19812080 has 20 divisors (see below), whose sum is σ = 46063272. Its totient is φ = 7924800.

The previous prime is 19812073. The next prime is 19812097. The reversal of 19812080 is 8021891.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 123746 + ... + 123905.

Almost surely, 2^19812080 is an apocalyptic number.

19812080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19812080 is an abundant number, since it is smaller than the sum of its proper divisors (26251192).

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

19812080 is a wasteful number, since it uses less digits than its factorization.

19812080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247664 (or 247658 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 19812080 is about 4451.0762743408. The cubic root of 19812080 is about 270.5889293877.

The spelling of 19812080 in words is "nineteen million, eight hundred twelve thousand, eighty".