20275 has 6 divisors (see below), whose sum is σ = 25172. Its totient is φ = 16200.

The previous prime is 20269. The next prime is 20287. The reversal of 20275 is 57202.

It is a happy number.

It is not a de Polignac number, because 20275 - 2⁷ = 20147 is a prime.

It is a super-2 number, since 2×20275² = 822151250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 381 + ... + 430.

2²⁰²⁷⁵ is an apocalyptic number.

20275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20275 is a deficient number, since it is larger than the sum of its proper divisors (4897).

20275 is an equidigital number, since it uses as much as digits as its factorization.

20275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821 (or 816 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 16.

The square root of 20275 is about 142.3903086590. The cubic root of 20275 is about 27.2680210735.

Adding to 20275 its reverse (57202), we get a palindrome (77477).

The spelling of 20275 in words is "twenty thousand, two hundred seventy-five".