20922309 has 6 divisors (see below), whose sum is σ = 30221126. Its totient is φ = 13948200.

The previous prime is 20922283. The next prime is 20922323. The reversal of 20922309 is 90322902.

It can be written as a sum of positive squares in only one way, i.e., 13616100 + 7306209 = 3690^2 + 2703^2 .

It is not a de Polignac number, because 20922309 - 2⁵ = 20922277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20921309) 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 5 ways as a sum of consecutive naturals, for example, 1162342 + ... + 1162359.

Almost surely, 2^20922309 is an apocalyptic number.

It is an amenable number.

20922309 is a deficient number, since it is larger than the sum of its proper divisors (9298817).

20922309 is a wasteful number, since it uses less digits than its factorization.

20922309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2324707 (or 2324704 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 20922309 is about 4574.0910572484. The cubic root of 20922309 is about 275.5517693059.

The spelling of 20922309 in words is "twenty million, nine hundred twenty-two thousand, three hundred nine".