20452404 has 48 divisors (see below), whose sum is σ = 55664000. Its totient is φ = 5842368.

The previous prime is 20452363. The next prime is 20452427. The reversal of 20452404 is 40425402.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1632 + ... + 6600.

Almost surely, 2^20452404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20452404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27832000).

20452404 is an abundant number, since it is smaller than the sum of its proper divisors (35211596).

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

20452404 is a wasteful number, since it uses less digits than its factorization.

20452404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4997 (or 4981 counting only the distinct ones).

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

The square root of 20452404 is about 4522.4334157619. The cubic root of 20452404 is about 273.4732095230.

Adding to 20452404 its reverse (40425402), we get a palindrome (60877806).

The spelling of 20452404 in words is "twenty million, four hundred fifty-two thousand, four hundred four".