20871824 has 40 divisors (see below), whose sum is σ = 41729472. Its totient is φ = 10108800.

The previous prime is 20871769. The next prime is 20871853. The reversal of 20871824 is 42817802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127967 + ... + 128129.

Almost surely, 2^20871824 is an apocalyptic number.

It is an amenable number.

20871824 is a deficient number, since it is larger than the sum of its proper divisors (20857648).

20871824 is a wasteful number, since it uses less digits than its factorization.

20871824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375 (or 369 counting only the distinct ones).

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

The square root of 20871824 is about 4568.5691414271. The cubic root of 20871824 is about 275.3299576623.

The spelling of 20871824 in words is "twenty million, eight hundred seventy-one thousand, eight hundred twenty-four".