20440422 has 48 divisors (see below), whose sum is σ = 46781280. Its totient is φ = 6437376.

The previous prime is 20440421. The next prime is 20440423. The reversal of 20440422 is 22404402.

20440422 is a `hidden beast` number, since 204 + 40 + 422 = 666.

It is an interprime number because it is at equal distance from previous prime (20440421) and next prime (20440423).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20440395 and 20440404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20440421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39904 + ... + 40412.

It is an arithmetic number, because the mean of its divisors is an integer number (974610).

Almost surely, 2^20440422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20440422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23390640).

20440422 is an abundant number, since it is smaller than the sum of its proper divisors (26340858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20440422 is a wasteful number, since it uses less digits than its factorization.

20440422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 20440422 is about 4521.1084923943. The cubic root of 20440422 is about 273.4197945129.

Adding to 20440422 its reverse (22404402), we get a palindrome (42844824).

The spelling of 20440422 in words is "twenty million, four hundred forty thousand, four hundred twenty-two".