19998560 has 24 divisors (see below), whose sum is σ = 47246976. Its totient is φ = 7999360.

The previous prime is 19998553. The next prime is 19998571. The reversal of 19998560 is 6589991.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62336 + ... + 62655.

It is an arithmetic number, because the mean of its divisors is an integer number (1968624).

Almost surely, 2^19998560 is an apocalyptic number.

19998560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19998560 is an abundant number, since it is smaller than the sum of its proper divisors (27248416).

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

19998560 is a wasteful number, since it uses less digits than its factorization.

19998560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125006 (or 124998 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 47.

The square root of 19998560 is about 4471.9749552072. The cubic root of 19998560 is about 271.4352469009.

The spelling of 19998560 in words is "nineteen million, nine hundred ninety-eight thousand, five hundred sixty".