20113705 has 4 divisors (see below), whose sum is σ = 24136452. Its totient is φ = 16090960.

The previous prime is 20113673. The next prime is 20113721. The reversal of 20113705 is 50731102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5817744 + 14295961 = 2412^2 + 3781^2 .

It is not a de Polignac number, because 20113705 - 2⁵ = 20113673 is a prime.

It is a super-2 number, since 2×20113705² = 809122257654050, which contains 22 as substring.

It is a Duffinian 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, 2011366 + ... + 2011375.

It is an arithmetic number, because the mean of its divisors is an integer number (6034113).

Almost surely, 2^20113705 is an apocalyptic number.

It is an amenable number.

20113705 is a deficient number, since it is larger than the sum of its proper divisors (4022747).

20113705 is an equidigital number, since it uses as much as digits as its factorization.

20113705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4022746.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 20113705 is about 4484.8305430640. The cubic root of 20113705 is about 271.9551946455.

Adding to 20113705 its reverse (50731102), we get a palindrome (70844807).

The spelling of 20113705 in words is "twenty million, one hundred thirteen thousand, seven hundred five".