20539875 has 16 divisors (see below), whose sum is σ = 34178976. Its totient is φ = 10954400.

The previous prime is 20539873. The next prime is 20539877. The reversal of 20539875 is 57893502.

It is an interprime number because it is at equal distance from previous prime (20539873) and next prime (20539877).

It is not a de Polignac number, because 20539875 - 2¹ = 20539873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20539873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27012 + ... + 27761.

It is an arithmetic number, because the mean of its divisors is an integer number (2136186).

Almost surely, 2^20539875 is an apocalyptic number.

20539875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20539875 is a deficient number, since it is larger than the sum of its proper divisors (13639101).

20539875 is an equidigital number, since it uses as much as digits as its factorization.

20539875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54791 (or 54781 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 20539875 is about 4532.0938869357. The cubic root of 20539875 is about 273.8625191628.

The spelling of 20539875 in words is "twenty million, five hundred thirty-nine thousand, eight hundred seventy-five".