20806875 has 60 divisors (see below), whose sum is σ = 39231192. Its totient is φ = 11016000.

The previous prime is 20806871. The next prime is 20806897. The reversal of 20806875 is 57860802.

It is not a de Polignac number, because 20806875 - 2² = 20806871 is a prime.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (20806871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 151807 + ... + 151943.

Almost surely, 2^20806875 is an apocalyptic number.

20806875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20806875 is a deficient number, since it is larger than the sum of its proper divisors (18424317).

20806875 is an frugal number, since it uses more digits than its factorization.

20806875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 20806875 is about 4561.4553598605. The cubic root of 20806875 is about 275.0440700722.

The spelling of 20806875 in words is "twenty million, eight hundred six thousand, eight hundred seventy-five".