19988688 has 40 divisors (see below), whose sum is σ = 52228800. Its totient is φ = 6586624.

The previous prime is 19988687. The next prime is 19988699. The reversal of 19988688 is 88688991.

It is a super-2 number, since 2×19988688² = 799095295922688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19988681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1933 + ... + 6611.

It is an arithmetic number, because the mean of its divisors is an integer number (1305720).

Almost surely, 2^19988688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19988688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26114400).

19988688 is an abundant number, since it is smaller than the sum of its proper divisors (32240112).

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

19988688 is a wasteful number, since it uses less digits than its factorization.

19988688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4779 (or 4773 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 57.

The square root of 19988688 is about 4470.8710560695. The cubic root of 19988688 is about 271.3905761880.

The spelling of 19988688 in words is "nineteen million, nine hundred eighty-eight thousand, six hundred eighty-eight".