19988226 has 48 divisors (see below), whose sum is σ = 46466784. Its totient is φ = 6187392.

The previous prime is 19988183. The next prime is 19988233. The reversal of 19988226 is 62288991.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25005 + ... + 25791.

It is an arithmetic number, because the mean of its divisors is an integer number (968058).

Almost surely, 2^19988226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19988226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23233392).

19988226 is an abundant number, since it is smaller than the sum of its proper divisors (26478558).

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

19988226 is a wasteful number, since it uses less digits than its factorization.

19988226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 895 (or 892 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 19988226 is about 4470.8193879869. The cubic root of 19988226 is about 271.3884852818.

The spelling of 19988226 in words is "nineteen million, nine hundred eighty-eight thousand, two hundred twenty-six".