20822 has 8 divisors (see below), whose sum is σ = 32400.
Its totient is φ = 10024.
The previous prime is 20809. The next prime is 20849. The reversal of 20822 is 22802.
It is a sphenic number, since it is the product of 3 distinct primes.
It is a junction number, because it is equal to n+sod(n) for n = 20797 and 20806.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122 + ... + 237.
It is an arithmetic number, because the mean of its divisors is an integer number (4050).
220822 is an apocalyptic number.
20822 is a deficient number, since it is larger than the sum of its proper divisors (11578).
20822 is a wasteful number, since it uses less digits than its factorization.
20822 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 390.
The product of its (nonzero) digits is 64, while the sum is 14.
The square root of 20822 is about 144.2983021383.
The cubic root of 20822 is about 27.5110699235.
The spelling of 20822 in words is "twenty thousand, eight hundred twenty-two".