19880280 has 240 divisors, whose sum is σ = 78652080. Its totient is φ = 4346496.

The previous prime is 19880261. The next prime is 19880297. The reversal of 19880280 is 8208891.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 59 ways as a sum of consecutive naturals, for example, 864349 + ... + 864371.

It is an arithmetic number, because the mean of its divisors is an integer number (327717).

Almost surely, 2^19880280 is an apocalyptic number.

19880280 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 19880280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39326040).

19880280 is an abundant number, since it is smaller than the sum of its proper divisors (58771800).

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

19880280 is a wasteful number, since it uses less digits than its factorization.

19880280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 19880280 is about 4458.7307611023. The cubic root of 19880280 is about 270.8990605500.

The spelling of 19880280 in words is "nineteen million, eight hundred eighty thousand, two hundred eighty".