19969984 has 14 divisors (see below), whose sum is σ = 39628064. Its totient is φ = 9984960.

The previous prime is 19969981. The next prime is 19969987. The reversal of 19969984 is 48996991.

It is an interprime number because it is at equal distance from previous prime (19969981) and next prime (19969987).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19969981) 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 as a sum of consecutive naturals, namely, 155952 + ... + 156079.

It is an arithmetic number, because the mean of its divisors is an integer number (2830576).

Almost surely, 2^19969984 is an apocalyptic number.

It is an amenable number.

19969984 is a deficient number, since it is larger than the sum of its proper divisors (19658080).

19969984 is an equidigital number, since it uses as much as digits as its factorization.

19969984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312043 (or 312033 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 55.

The square root of 19969984 is about 4468.7788041030. The cubic root of 19969984 is about 271.3059004046.

The spelling of 19969984 in words is "nineteen million, nine hundred sixty-nine thousand, nine hundred eighty-four".