20131705 has 8 divisors (see below), whose sum is σ = 26354304. Its totient is φ = 14641200.

The previous prime is 20131681. The next prime is 20131717. The reversal of 20131705 is 50713102.

20131705 = 765² + 766² + ... + 797².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20131705 - 2⁵ = 20131673 is a prime.

It is a Duffinian 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, 182961 + ... + 183070.

It is an arithmetic number, because the mean of its divisors is an integer number (3294288).

Almost surely, 2^20131705 is an apocalyptic number.

It is an amenable number.

20131705 is a deficient number, since it is larger than the sum of its proper divisors (6222599).

20131705 is a wasteful number, since it uses less digits than its factorization.

20131705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366047.

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

The square root of 20131705 is about 4486.8368590801. The cubic root of 20131705 is about 272.0362957980.

Adding to 20131705 its reverse (50713102), we get a palindrome (70844807).

The spelling of 20131705 in words is "twenty million, one hundred thirty-one thousand, seven hundred five".