20051705 has 8 divisors (see below), whose sum is σ = 24142272. Its totient is φ = 15987888.

The previous prime is 20051683. The next prime is 20051711. The reversal of 20051705 is 50715002.

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 20051705 - 2⁶ = 20051641 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 7 ways as a sum of consecutive naturals, for example, 4997 + ... + 8066.

It is an arithmetic number, because the mean of its divisors is an integer number (3017784).

Almost surely, 2^20051705 is an apocalyptic number.

It is an amenable number.

20051705 is a deficient number, since it is larger than the sum of its proper divisors (4090567).

20051705 is a wasteful number, since it uses less digits than its factorization.

20051705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13375.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 20051705 is about 4477.9130183602. The cubic root of 20051705 is about 271.6754753104.

Adding to 20051705 its reverse (50715002), we get a palindrome (70766707).

The spelling of 20051705 in words is "twenty million, fifty-one thousand, seven hundred five".