19988955 has 96 divisors (see below), whose sum is σ = 43130880. Its totient is φ = 8363520.

The previous prime is 19988951. The next prime is 19988971. The reversal of 19988955 is 55988991.

It is not a de Polignac number, because 19988955 - 2² = 19988951 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19988951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 224551 + ... + 224639.

It is an arithmetic number, because the mean of its divisors is an integer number (449280).

Almost surely, 2^19988955 is an apocalyptic number.

19988955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19988955 is an abundant number, since it is smaller than the sum of its proper divisors (23141925).

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

19988955 is a wasteful number, since it uses less digits than its factorization.

19988955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 158 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 54.

The square root of 19988955 is about 4470.9009159229. The cubic root of 19988955 is about 271.3917845541.

The spelling of 19988955 in words is "nineteen million, nine hundred eighty-eight thousand, nine hundred fifty-five".