20922265 has 24 divisors (see below), whose sum is σ = 31457160. Its totient is φ = 13241088.

The previous prime is 20922199. The next prime is 20922269. The reversal of 20922265 is 56222902.

It can be written as a sum of positive squares in 4 ways, for example, as 2569609 + 18352656 = 1603^2 + 4284^2 .

It is not a de Polignac number, because 20922265 - 2²³ = 12533657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20922269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100 + ... + 6469.

It is an arithmetic number, because the mean of its divisors is an integer number (1310715).

Almost surely, 2^20922265 is an apocalyptic number.

It is an amenable number.

20922265 is a deficient number, since it is larger than the sum of its proper divisors (10534895).

20922265 is a wasteful number, since it uses less digits than its factorization.

20922265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6601 (or 6594 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 20922265 is about 4574.0862475472. The cubic root of 20922265 is about 275.5515761423.

The spelling of 20922265 in words is "twenty million, nine hundred twenty-two thousand, two hundred sixty-five".