19808208 has 120 divisors (see below), whose sum is σ = 64970048. Its totient is φ = 5515776.

The previous prime is 19808183. The next prime is 19808227. The reversal of 19808208 is 80280891.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 43116 + ... + 43572.

Almost surely, 2^19808208 is an apocalyptic number.

19808208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19808208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32485024).

19808208 is an abundant number, since it is smaller than the sum of its proper divisors (45161840).

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

19808208 is a wasteful number, since it uses less digits than its factorization.

19808208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521 (or 512 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 19808208 is about 4450.6413021047. The cubic root of 19808208 is about 270.5713006044.

The spelling of 19808208 in words is "nineteen million, eight hundred eight thousand, two hundred eight".