19802988 has 24 divisors (see below), whose sum is σ = 51341360. Its totient is φ = 6600960.

The previous prime is 19802987. The next prime is 19802999. The reversal of 19802988 is 88920891.

It is not an unprimeable number, because it can be changed into a prime (19802987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91573 + ... + 91788.

Almost surely, 2^19802988 is an apocalyptic number.

19802988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19802988 is an abundant number, since it is smaller than the sum of its proper divisors (31538372).

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

19802988 is a wasteful number, since it uses less digits than its factorization.

19802988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183374 (or 183366 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 19802988 is about 4450.0548311229. The cubic root of 19802988 is about 270.5475308911.

The spelling of 19802988 in words is "nineteen million, eight hundred two thousand, nine hundred eighty-eight".