20112705 has 40 divisors (see below), whose sum is σ = 36773352. Its totient is φ = 10513152.

The previous prime is 20112661. The next prime is 20112721. The reversal of 20112705 is 50721102.

It can be written as a sum of positive squares in 4 ways, for example, as 505521 + 19607184 = 711^2 + 4428^2 .

It is not a de Polignac number, because 20112705 - 2⁶ = 20112641 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 20997 + ... + 21933.

Almost surely, 2^20112705 is an apocalyptic number.

It is an amenable number.

20112705 is a deficient number, since it is larger than the sum of its proper divisors (16660647).

20112705 is an equidigital number, since it uses as much as digits as its factorization.

20112705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007 (or 998 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 20112705 is about 4484.7190547458. The cubic root of 20112705 is about 271.9506876074.

Adding to 20112705 its reverse (50721102), we get a palindrome (70833807).

The spelling of 20112705 in words is "twenty million, one hundred twelve thousand, seven hundred five".