20225424 has 80 divisors (see below), whose sum is σ = 55988480. Its totient is φ = 6272640.

The previous prime is 20225419. The next prime is 20225477. The reversal of 20225424 is 42452202.

It is a self number, because there is not a number n which added to its sum of digits gives 20225424.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60939 + ... + 61269.

It is an arithmetic number, because the mean of its divisors is an integer number (699856).

Almost surely, 2^20225424 is an apocalyptic number.

20225424 is a gapful number since it is divisible by the number (24) 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 20225424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27994240).

20225424 is an abundant number, since it is smaller than the sum of its proper divisors (35763056).

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

20225424 is a wasteful number, since it uses less digits than its factorization.

20225424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 21.

The square root of 20225424 is about 4497.2685043257. The cubic root of 20225424 is about 272.4577787179.

Adding to 20225424 its reverse (42452202), we get a palindrome (62677626).

The spelling of 20225424 in words is "twenty million, two hundred twenty-five thousand, four hundred twenty-four".