20135705 has 4 divisors (see below), whose sum is σ = 24162852. Its totient is φ = 16108560.

The previous prime is 20135683. The next prime is 20135737. The reversal of 20135705 is 50753102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50753102 = 2 ⋅25376551.

It can be written as a sum of positive squares in 2 ways, for example, as 6416089 + 13719616 = 2533^2 + 3704^2 .

It is not a de Polignac number, because 20135705 - 2⁶ = 20135641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2013566 + ... + 2013575.

It is an arithmetic number, because the mean of its divisors is an integer number (6040713).

Almost surely, 2^20135705 is an apocalyptic number.

It is an amenable number.

20135705 is a deficient number, since it is larger than the sum of its proper divisors (4027147).

20135705 is an equidigital number, since it uses as much as digits as its factorization.

20135705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4027146.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 20135705 is about 4487.2825852625. The cubic root of 20135705 is about 272.0543117108.

Adding to 20135705 its reverse (50753102), we get a palindrome (70888807).

The spelling of 20135705 in words is "twenty million, one hundred thirty-five thousand, seven hundred five".