20540275 has 12 divisors (see below), whose sum is σ = 29108752. Its totient is φ = 14084640.

The previous prime is 20540251. The next prime is 20540279. The reversal of 20540275 is 57204502.

It is not a de Polignac number, because 20540275 - 2⁵ = 20540243 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20540279) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58512 + ... + 58861.

Almost surely, 2^20540275 is an apocalyptic number.

20540275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20540275 is a deficient number, since it is larger than the sum of its proper divisors (8568477).

20540275 is a wasteful number, since it uses less digits than its factorization.

20540275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117390 (or 117385 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 20540275 is about 4532.1380164333. The cubic root of 20540275 is about 273.8642969129.

Adding to 20540275 its reverse (57204502), we get a palindrome (77744777).

The spelling of 20540275 in words is "twenty million, five hundred forty thousand, two hundred seventy-five".