19898880 has 80 divisors (see below), whose sum is σ = 63638784. Its totient is φ = 5304320.

The previous prime is 19898873. The next prime is 19898881. The reversal of 19898880 is 8889891.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (19898881) 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, 6385 + ... + 8975.

Almost surely, 2^19898880 is an apocalyptic number.

19898880 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 19898880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31819392).

19898880 is an abundant number, since it is smaller than the sum of its proper divisors (43739904).

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

19898880 is an equidigital number, since it uses as much as digits as its factorization.

19898880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2617 (or 2601 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 51.

The square root of 19898880 is about 4460.8160688376. The cubic root of 19898880 is about 270.9835186484.

The spelling of 19898880 in words is "nineteen million, eight hundred ninety-eight thousand, eight hundred eighty".