20424225 has 48 divisors (see below), whose sum is σ = 36372672. Its totient is φ = 10076160.

The previous prime is 20424199. The next prime is 20424247. The reversal of 20424225 is 52242402.

It is not a de Polignac number, because 20424225 - 2⁵ = 20424193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 105729 + ... + 105921.

It is an arithmetic number, because the mean of its divisors is an integer number (757764).

Almost surely, 2^20424225 is an apocalyptic number.

20424225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20424225 is a deficient number, since it is larger than the sum of its proper divisors (15948447).

20424225 is a wasteful number, since it uses less digits than its factorization.

20424225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 301 counting only the distinct ones).

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

The square root of 20424225 is about 4519.3168731568. The cubic root of 20424225 is about 273.3475561044.

Adding to 20424225 its reverse (52242402), we get a palindrome (72666627).

The spelling of 20424225 in words is "twenty million, four hundred twenty-four thousand, two hundred twenty-five".