20422240 has 48 divisors (see below), whose sum is σ = 48731760. Its totient is φ = 8087040.

The previous prime is 20422189. The next prime is 20422243. The reversal of 20422240 is 4222402.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20422243) 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 7 ways as a sum of consecutive naturals, for example, 16855 + ... + 18025.

It is an arithmetic number, because the mean of its divisors is an integer number (1015245).

Almost surely, 2^20422240 is an apocalyptic number.

20422240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20422240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24365880).

20422240 is an abundant number, since it is smaller than the sum of its proper divisors (28309520).

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

20422240 is a wasteful number, since it uses less digits than its factorization.

20422240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1295 (or 1287 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 20422240 is about 4519.0972549836. The cubic root of 20422240 is about 273.3387004036.

Adding to 20422240 its reverse (4222402), we get a palindrome (24644642).

The spelling of 20422240 in words is "twenty million, four hundred twenty-two thousand, two hundred forty".