19880000 has 140 divisors (see below), whose sum is σ = 57131712. Its totient is φ = 6720000.

The previous prime is 19879997. The next prime is 19880011. The reversal of 19880000 is 8891.

It is a tau number, because it is divible by the number of its divisors (140).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 279965 + ... + 280035.

Almost surely, 2^19880000 is an apocalyptic number.

19880000 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 19880000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28565856).

19880000 is an abundant number, since it is smaller than the sum of its proper divisors (37251712).

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

19880000 is an frugal number, since it uses more digits than its factorization.

19880000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 19880000 is about 4458.6993619216. The cubic root of 19880000 is about 270.8977887354.

Adding to 19880000 its reverse (8891), we get a palindrome (19888891).

The spelling of 19880000 in words is "nineteen million, eight hundred eighty thousand".