20221424 has 40 divisors (see below), whose sum is σ = 41187840. Its totient is φ = 9604800.

The previous prime is 20221403. The next prime is 20221427. The reversal of 20221424 is 42412202.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28919 + ... + 29609.

It is an arithmetic number, because the mean of its divisors is an integer number (1029696).

Almost surely, 2^20221424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20221424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20593920).

20221424 is an abundant number, since it is smaller than the sum of its proper divisors (20966416).

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

20221424 is a wasteful number, since it uses less digits than its factorization.

20221424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789 (or 783 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 20221424 is about 4496.8237679500. The cubic root of 20221424 is about 272.4398161284.

Adding to 20221424 its reverse (42412202), we get a palindrome (62633626).

The spelling of 20221424 in words is "twenty million, two hundred twenty-one thousand, four hundred twenty-four".