20871875 has 12 divisors (see below), whose sum is σ = 26092080. Its totient is φ = 16695000.

The previous prime is 20871863. The next prime is 20871881. The reversal of 20871875 is 57817802.

It is not a de Polignac number, because 20871875 - 2⁴ = 20871859 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 215 + ... + 6464.

It is an arithmetic number, because the mean of its divisors is an integer number (2174340).

Almost surely, 2^20871875 is an apocalyptic number.

20871875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20871875 is a deficient number, since it is larger than the sum of its proper divisors (5220205).

20871875 is an frugal number, since it uses more digits than its factorization.

20871875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6704 (or 6684 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 20871875 is about 4568.5747230400. The cubic root of 20871875 is about 275.3301819170.

The spelling of 20871875 in words is "twenty million, eight hundred seventy-one thousand, eight hundred seventy-five".