20822225 has 6 divisors (see below), whose sum is σ = 25819590. Its totient is φ = 16657760.

The previous prime is 20822201. The next prime is 20822227. The reversal of 20822225 is 52222802.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 92416 + 20729809 = 304^2 + 4553^2 .

It is not a de Polignac number, because 20822225 - 2¹⁸ = 20560081 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20822225.

It is not an unprimeable number, because it can be changed into a prime (20822227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 416420 + ... + 416469.

It is an arithmetic number, because the mean of its divisors is an integer number (4303265).

Almost surely, 2^20822225 is an apocalyptic number.

20822225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20822225 is a deficient number, since it is larger than the sum of its proper divisors (4997365).

20822225 is an equidigital number, since it uses as much as digits as its factorization.

20822225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832899 (or 832894 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 20822225 is about 4563.1376266775. The cubic root of 20822225 is about 275.1116901685. Note that the first 3 decimals are identical.

The spelling of 20822225 in words is "twenty million, eight hundred twenty-two thousand, two hundred twenty-five".