20004282 has 24 divisors (see below), whose sum is σ = 43502004. Its totient is φ = 6643584.

The previous prime is 20004253. The next prime is 20004289. The reversal of 20004282 is 28240002.

It can be written as a sum of positive squares in 2 ways, for example, as 19793601 + 210681 = 4449^2 + 459^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20004289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3378 + ... + 7170.

Almost surely, 2^20004282 is an apocalyptic number.

20004282 is an abundant number, since it is smaller than the sum of its proper divisors (23497722).

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

20004282 is a wasteful number, since it uses less digits than its factorization.

20004282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4094 (or 4091 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 20004282 is about 4472.6146715316. The cubic root of 20004282 is about 271.4611321709.

Adding to 20004282 its reverse (28240002), we get a palindrome (48244284).

The spelling of 20004282 in words is "twenty million, four thousand, two hundred eighty-two".