20871056 has 20 divisors (see below), whose sum is σ = 40509312. Its totient is φ = 10417056.

The previous prime is 20871049. The next prime is 20871077. The reversal of 20871056 is 65017802.

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, 15065 + ... + 16391.

Almost surely, 2^20871056 is an apocalyptic number.

It is an amenable number.

20871056 is a deficient number, since it is larger than the sum of its proper divisors (19638256).

20871056 is a wasteful number, since it uses less digits than its factorization.

20871056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2318 (or 2312 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 20871056 is about 4568.4850880790. The cubic root of 20871056 is about 275.3265806055.

Adding to 20871056 its reverse (65017802), we get a palindrome (85888858).

The spelling of 20871056 in words is "twenty million, eight hundred seventy-one thousand, fifty-six".