22420209 has 32 divisors (see below), whose sum is σ = 36449280. Its totient is φ = 11973312.

The previous prime is 22420207. The next prime is 22420213. The reversal of 22420209 is 90202422.

It is not a de Polignac number, because 22420209 - 2¹ = 22420207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (22420201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32779 + ... + 33455.

It is an arithmetic number, because the mean of its divisors is an integer number (1139040).

Almost surely, 2^22420209 is an apocalyptic number.

It is an amenable number.

22420209 is a deficient number, since it is larger than the sum of its proper divisors (14029071).

22420209 is a wasteful number, since it uses less digits than its factorization.

22420209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 22420209 is about 4734.9983104538. The cubic root of 22420209 is about 281.9766969326.

The spelling of 22420209 in words is "twenty-two million, four hundred twenty thousand, two hundred nine".