19999705 has 16 divisors (see below), whose sum is σ = 27086400. Its totient is φ = 14042560.

The previous prime is 19999697. The next prime is 19999729. The reversal of 19999705 is 50799991.

It is not a de Polignac number, because 19999705 - 2³ = 19999697 is a prime.

It is an unprimeable number.

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, 4675 + ... + 7864.

It is an arithmetic number, because the mean of its divisors is an integer number (1692900).

Almost surely, 2^19999705 is an apocalyptic number.

It is an amenable number.

19999705 is a deficient number, since it is larger than the sum of its proper divisors (7086695).

19999705 is a wasteful number, since it uses less digits than its factorization.

19999705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12584.

The product of its (nonzero) digits is 229635, while the sum is 49.

The square root of 19999705 is about 4472.1029728753. The cubic root of 19999705 is about 271.4404270643.

The spelling of 19999705 in words is "nineteen million, nine hundred ninety-nine thousand, seven hundred five".