20201705 has 16 divisors (see below), whose sum is σ = 25570944. Its totient is φ = 15290880.

The previous prime is 20201689. The next prime is 20201711. The reversal of 20201705 is 50710202.

It is not a de Polignac number, because 20201705 - 2⁴ = 20201689 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10250 + ... + 12060.

It is an arithmetic number, because the mean of its divisors is an integer number (1598184).

Almost surely, 2^20201705 is an apocalyptic number.

It is an amenable number.

20201705 is a deficient number, since it is larger than the sum of its proper divisors (5369239).

20201705 is a wasteful number, since it uses less digits than its factorization.

20201705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936.

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 20201705 is about 4494.6306856070. The cubic root of 20201705 is about 272.3512304130.

Adding to 20201705 its reverse (50710202), we get a palindrome (70911907).

The spelling of 20201705 in words is "twenty million, two hundred one thousand, seven hundred five".