19998680 has 32 divisors (see below), whose sum is σ = 48459600. Its totient is φ = 7383936.

The previous prime is 19998679. The next prime is 19998683. The reversal of 19998680 is 8689991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998683) 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, 18710 + ... + 19749.

Almost surely, 2^19998680 is an apocalyptic number.

19998680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19998680 is an abundant number, since it is smaller than the sum of its proper divisors (28460920).

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

19998680 is a wasteful number, since it uses less digits than its factorization.

19998680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38483 (or 38479 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 19998680 is about 4471.9883720779. The cubic root of 19998680 is about 271.4357898094.

The spelling of 19998680 in words is "nineteen million, nine hundred ninety-eight thousand, six hundred eighty".