19705135 has 24 divisors (see below), whose sum is σ = 25560864. Its totient is φ = 14551680.

The previous prime is 19705117. The next prime is 19705139. The reversal of 19705135 is 53150791.

It is not a de Polignac number, because 19705135 - 2²³ = 11316527 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19705097 and 19705106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19705139) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 323005 + ... + 323065.

It is an arithmetic number, because the mean of its divisors is an integer number (1065036).

Almost surely, 2^19705135 is an apocalyptic number.

19705135 is a deficient number, since it is larger than the sum of its proper divisors (5855729).

19705135 is an equidigital number, since it uses as much as digits as its factorization.

19705135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 4725, while the sum is 31.

The square root of 19705135 is about 4439.0466318794. The cubic root of 19705135 is about 270.1011737892.

The spelling of 19705135 in words is "nineteen million, seven hundred five thousand, one hundred thirty-five".