19984845 has 16 divisors (see below), whose sum is σ = 32415552. Its totient is φ = 10512000.

The previous prime is 19984831. The next prime is 19984849. The reversal of 19984845 is 54848991.

It is not a de Polignac number, because 19984845 - 2⁴ = 19984829 is a prime.

It is a super-3 number, since 3×19984845³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 19984794 and 19984803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19984849) 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 15 ways as a sum of consecutive naturals, for example, 8031 + ... + 10220.

It is an arithmetic number, because the mean of its divisors is an integer number (2025972).

Almost surely, 2^19984845 is an apocalyptic number.

19984845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19984845 is a deficient number, since it is larger than the sum of its proper divisors (12430707).

19984845 is a wasteful number, since it uses less digits than its factorization.

19984845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18332.

The product of its digits is 414720, while the sum is 48.

The square root of 19984845 is about 4470.4412533888. The cubic root of 19984845 is about 271.3731826697.

The spelling of 19984845 in words is "nineteen million, nine hundred eighty-four thousand, eight hundred forty-five".