20841872 has 10 divisors (see below), whose sum is σ = 40381158. Its totient is φ = 10420928.

The previous prime is 20841871. The next prime is 20841883. The reversal of 20841872 is 27814802.

It can be written as a sum of positive squares in only one way, i.e., 14868736 + 5973136 = 3856^2 + 2444^2 .

It is not an unprimeable number, because it can be changed into a prime (20841871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 651293 + ... + 651324.

Almost surely, 2^20841872 is an apocalyptic number.

It is an amenable number.

20841872 is a deficient number, since it is larger than the sum of its proper divisors (19539286).

20841872 is a wasteful number, since it uses less digits than its factorization.

20841872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302625 (or 1302619 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 20841872 is about 4565.2899141237. The cubic root of 20841872 is about 275.1981910148.

The spelling of 20841872 in words is "twenty million, eight hundred forty-one thousand, eight hundred seventy-two".