20522 has 8 divisors (see below), whose sum is σ = 31872. Its totient is φ = 9900.

The previous prime is 20521. The next prime is 20533. The reversal of 20522 is 22502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 7 and base 11.

It is a nialpdrome in base 12.

It is a zygodrome in base 4.

It is not an unprimeable number, because it can be changed into a prime (20521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104 + ... + 227.

It is an arithmetic number, because the mean of its divisors is an integer number (3984).

2²⁰⁵²² is an apocalyptic number.

20522 is a deficient number, since it is larger than the sum of its proper divisors (11350).

20522 is a wasteful number, since it uses less digits than its factorization.

20522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364.

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 20522 is about 143.2550173641. The cubic root of 20522 is about 27.3783052381.

It can be divided in two parts, 20 and 522, that multiplied together give a triangular number (10440 = T₁₄₄).

The spelling of 20522 in words is "twenty thousand, five hundred twenty-two".