19999744 has 22 divisors (see below), whose sum is σ = 39982004.
Its totient is φ = 9999360.
The previous prime is 19999739. The next prime is 19999789. The reversal of 19999744 is 44799991.
It is a junction number, because it is equal to n+sod(n) for n = 19999691 and 19999700.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8742 + ... + 10789.
Almost surely, 219999744 is an apocalyptic number.
It is an amenable number.
19999744 is a deficient number, since it is larger than the sum of its proper divisors (19982260).
19999744 is an equidigital number, since it uses as much as digits as its factorization.
19999744 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 19551 (or 19533 counting only the distinct ones).
The product of its digits is 734832, while the sum is 52.
The square root of 19999744 is about 4472.1073332379.
The cubic root of 19999744 is about 271.4406035030.
The spelling of 19999744 in words is "nineteen million, nine hundred ninety-nine thousand, seven hundred forty-four".