20105704 has 16 divisors (see below), whose sum is σ = 38045700. Its totient is φ = 9960192.

The previous prime is 20105693. The next prime is 20105711. The reversal of 20105704 is 40750102.

It can be written as a sum of positive squares in 2 ways, for example, as 17222500 + 2883204 = 4150^2 + 1698^2 .

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, 10657 + ... + 12400.

Almost surely, 2^20105704 is an apocalyptic number.

It is an amenable number.

20105704 is a deficient number, since it is larger than the sum of its proper divisors (17939996).

20105704 is a wasteful number, since it uses less digits than its factorization.

20105704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23172 (or 23168 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 20105704 is about 4483.9384473920. The cubic root of 20105704 is about 271.9191296491.

Adding to 20105704 its reverse (40750102), we get a palindrome (60855806).

The spelling of 20105704 in words is "twenty million, one hundred five thousand, seven hundred four".