20022309 has 20 divisors (see below), whose sum is σ = 30644460. Its totient is φ = 13020480.

The previous prime is 20022283. The next prime is 20022323. The reversal of 20022309 is 90322002.

It can be written as a sum of positive squares in 2 ways, for example, as 9641025 + 10381284 = 3105^2 + 3222^2 .

It is not a de Polignac number, because 20022309 - 2¹⁹ = 19498021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20022291 and 20022300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20022109) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 307 + ... + 6335.

It is an arithmetic number, because the mean of its divisors is an integer number (1532223).

Almost surely, 2^20022309 is an apocalyptic number.

It is an amenable number.

20022309 is a deficient number, since it is larger than the sum of its proper divisors (10622151).

20022309 is an equidigital number, since it uses as much as digits as its factorization.

20022309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6082 (or 6073 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 20022309 is about 4474.6294818677. The cubic root of 20022309 is about 271.5426507276.

The spelling of 20022309 in words is "twenty million, twenty-two thousand, three hundred nine".