20822165 has 16 divisors (see below), whose sum is σ = 30753408. Its totient is φ = 13179456.

The previous prime is 20822149. The next prime is 20822177. The reversal of 20822165 is 56122802.

It is a cyclic number.

It is not a de Polignac number, because 20822165 - 2⁴ = 20822149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22427 + ... + 23336.

It is an arithmetic number, because the mean of its divisors is an integer number (1922088).

Almost surely, 2^20822165 is an apocalyptic number.

It is an amenable number.

20822165 is a deficient number, since it is larger than the sum of its proper divisors (9931243).

20822165 is a wasteful number, since it uses less digits than its factorization.

20822165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45788.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 20822165 is about 4563.1310522491. The cubic root of 20822165 is about 275.1114259202. Note that the first 3 decimals are identical.

Adding to 20822165 its reverse (56122802), we get a palindrome (76944967).

The spelling of 20822165 in words is "twenty million, eight hundred twenty-two thousand, one hundred sixty-five".