19988268 has 12 divisors (see below), whose sum is σ = 46639320. Its totient is φ = 6662752.

The previous prime is 19988257. The next prime is 19988291. The reversal of 19988268 is 86288991.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 19988268.

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, 832833 + ... + 832856.

It is an arithmetic number, because the mean of its divisors is an integer number (3886610).

Almost surely, 2^19988268 is an apocalyptic number.

It is an amenable number.

19988268 is an abundant number, since it is smaller than the sum of its proper divisors (26651052).

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

19988268 is a wasteful number, since it uses less digits than its factorization.

19988268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665696 (or 1665694 counting only the distinct ones).

The product of its digits is 497664, while the sum is 51.

The square root of 19988268 is about 4470.8240851100. The cubic root of 19988268 is about 271.3886753655.

The spelling of 19988268 in words is "nineteen million, nine hundred eighty-eight thousand, two hundred sixty-eight".