20575 has 6 divisors (see below), whose sum is σ = 25544. Its totient is φ = 16440.

The previous prime is 20563. The next prime is 20593. The reversal of 20575 is 57502.

It is a happy number.

It is not a de Polignac number, because 20575 - 2⁵ = 20543 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a zygodrome in base 4.

It is a congruent 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, 387 + ... + 436.

2²⁰⁵⁷⁵ is an apocalyptic number.

20575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20575 is a deficient number, since it is larger than the sum of its proper divisors (4969).

20575 is an equidigital number, since it uses as much as digits as its factorization.

20575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833 (or 828 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 19.

The square root of 20575 is about 143.4398828778. The cubic root of 20575 is about 27.4018539957.

It can be divided in two parts, 20 and 575, that added together give a palindrome (595).

The spelling of 20575 in words is "twenty thousand, five hundred seventy-five".