20404452 has 12 divisors (see below), whose sum is σ = 47610416. Its totient is φ = 6801480.

The previous prime is 20404441. The next prime is 20404453. The reversal of 20404452 is 25440402.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×20404452² = 832683322840608, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20404453) by changing a digit.

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, 850174 + ... + 850197.

Almost surely, 2^20404452 is an apocalyptic number.

It is an amenable number.

20404452 is an abundant number, since it is smaller than the sum of its proper divisors (27205964).

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

20404452 is a wasteful number, since it uses less digits than its factorization.

20404452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700378 (or 1700376 counting only the distinct ones).

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

The square root of 20404452 is about 4517.1287340522. The cubic root of 20404452 is about 273.2593169936.

Adding to 20404452 its reverse (25440402), we get a palindrome (45844854).

The spelling of 20404452 in words is "twenty million, four hundred four thousand, four hundred fifty-two".