20508875 has 8 divisors (see below), whose sum is σ = 25595232. Its totient is φ = 16407000.

The previous prime is 20508853. The next prime is 20508877. The reversal of 20508875 is 57880502.

It is not a de Polignac number, because 20508875 - 2⁶ = 20508811 is a prime.

It is a super-2 number, since 2×20508875² = 841227907531250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20508877) by changing a digit.

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, 81911 + ... + 82160.

It is an arithmetic number, because the mean of its divisors is an integer number (3199404).

Almost surely, 2^20508875 is an apocalyptic number.

20508875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20508875 is a deficient number, since it is larger than the sum of its proper divisors (5086357).

20508875 is an equidigital number, since it uses as much as digits as its factorization.

20508875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164086 (or 164076 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 20508875 is about 4528.6725428099. The cubic root of 20508875 is about 273.7246732614.

The spelling of 20508875 in words is "twenty million, five hundred eight thousand, eight hundred seventy-five".