20641424 has 20 divisors (see below), whose sum is σ = 40650300. Its totient is φ = 10151040.

The previous prime is 20641403. The next prime is 20641457. The reversal of 20641424 is 42414602.

It can be written as a sum of positive squares in 2 ways, for example, as 1281424 + 19360000 = 1132^2 + 4400^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20641424.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 9599 + ... + 11550.

It is an arithmetic number, because the mean of its divisors is an integer number (2032515).

Almost surely, 2^20641424 is an apocalyptic number.

It is an amenable number.

20641424 is a deficient number, since it is larger than the sum of its proper divisors (20008876).

20641424 is a wasteful number, since it uses less digits than its factorization.

20641424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21218 (or 21212 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 20641424 is about 4543.2833941985. The cubic root of 20641424 is about 274.3131022172.

The spelling of 20641424 in words is "twenty million, six hundred forty-one thousand, four hundred twenty-four".