20306875 has 10 divisors (see below), whose sum is σ = 25376252. Its totient is φ = 16245000.

The previous prime is 20306837. The next prime is 20306887. The reversal of 20306875 is 57860302.

It is not a de Polignac number, because 20306875 - 2¹¹ = 20304827 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 15621 + ... + 16870.

Almost surely, 2^20306875 is an apocalyptic number.

20306875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20306875 is a deficient number, since it is larger than the sum of its proper divisors (5069377).

20306875 is an frugal number, since it uses more digits than its factorization.

20306875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32511 (or 32496 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20306875 is about 4506.3150134006. The cubic root of 20306875 is about 272.8230324504.

The spelling of 20306875 in words is "twenty million, three hundred six thousand, eight hundred seventy-five".