19916280 has 112 divisors (see below), whose sum is σ = 67285080. Its totient is φ = 5303232.

The previous prime is 19916269. The next prime is 19916329. The reversal of 19916280 is 8261991.

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 polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 28819 + ... + 29501.

Almost surely, 2^19916280 is an apocalyptic number.

19916280 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 19916280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33642540).

19916280 is an abundant number, since it is smaller than the sum of its proper divisors (47368800).

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

19916280 is an equidigital number, since it uses as much as digits as its factorization.

19916280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 19916280 is about 4462.7659584612. The cubic root of 19916280 is about 271.0624802040.

The spelling of 19916280 in words is "nineteen million, nine hundred sixteen thousand, two hundred eighty".