19939705 has 8 divisors (see below), whose sum is σ = 24062400. Its totient is φ = 15861936.

The previous prime is 19939693. The next prime is 19939729. The reversal of 19939705 is 50793991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19939705 - 2⁹ = 19939193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10245 + ... + 12034.

It is an arithmetic number, because the mean of its divisors is an integer number (3007800).

Almost surely, 2^19939705 is an apocalyptic number.

It is an amenable number.

19939705 is a deficient number, since it is larger than the sum of its proper divisors (4122695).

19939705 is a wasteful number, since it uses less digits than its factorization.

19939705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22463.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 19939705 is about 4465.3896806438. The cubic root of 19939705 is about 271.1687107316.

The spelling of 19939705 in words is "nineteen million, nine hundred thirty-nine thousand, seven hundred five".