19808118 has 32 divisors (see below), whose sum is σ = 48021120. Its totient is φ = 6002280.

The previous prime is 19808071. The next prime is 19808123. The reversal of 19808118 is 81180891.

19808118 is a modest number, since divided by 8118 gives 198 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16080 + ... + 17267.

It is an arithmetic number, because the mean of its divisors is an integer number (1500660).

Almost surely, 2^19808118 is an apocalyptic number.

19808118 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19808118 is an abundant number, since it is smaller than the sum of its proper divisors (28213002).

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

19808118 is a wasteful number, since it uses less digits than its factorization.

19808118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33369 (or 33363 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The square root of 19808118 is about 4450.6311911908. The cubic root of 19808118 is about 270.5708908172.

The spelling of 19808118 in words is "nineteen million, eight hundred eight thousand, one hundred eighteen".