19688880 has 40 divisors (see below), whose sum is σ = 61036272. Its totient is φ = 5250304.

The previous prime is 19688869. The next prime is 19688887. The reversal of 19688880 is 8888691.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (19688887) 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, 40779 + ... + 41258.

Almost surely, 2^19688880 is an apocalyptic number.

19688880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19688880 is an abundant number, since it is smaller than the sum of its proper divisors (41347392).

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

19688880 is a wasteful number, since it uses less digits than its factorization.

19688880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82053 (or 82047 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 48.

The square root of 19688880 is about 4437.2153429826. The cubic root of 19688880 is about 270.0268834686.

The spelling of 19688880 in words is "nineteen million, six hundred eighty-eight thousand, eight hundred eighty".