20422229 has 4 divisors (see below), whose sum is σ = 21310176. Its totient is φ = 19534284.

The previous prime is 20422189. The next prime is 20422243. The reversal of 20422229 is 92222402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92222402 = 2 ⋅46111201.

It is a cyclic number.

It is not a de Polignac number, because 20422229 - 2²⁴ = 3645013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 887923 = 20422229 / (2 + 0 + 4 + 2 + 2 + 2 + 2 + 9).

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 (20422249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443939 + ... + 443984.

It is an arithmetic number, because the mean of its divisors is an integer number (5327544).

Almost surely, 2^20422229 is an apocalyptic number.

It is an amenable number.

20422229 is a deficient number, since it is larger than the sum of its proper divisors (887947).

20422229 is an equidigital number, since it uses as much as digits as its factorization.

20422229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887946.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 20422229 is about 4519.0960379262. The cubic root of 20422229 is about 273.3386513276.

The spelling of 20422229 in words is "twenty million, four hundred twenty-two thousand, two hundred twenty-nine".