20004450 has 48 divisors (see below), whose sum is σ = 49940256. Its totient is φ = 5299200.

The previous prime is 20004431. The next prime is 20004451. The reversal of 20004450 is 5440002.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20004451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28605 + ... + 29295.

It is an arithmetic number, because the mean of its divisors is an integer number (1040422).

Almost surely, 2^20004450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20004450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24970128).

20004450 is an abundant number, since it is smaller than the sum of its proper divisors (29935806).

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

20004450 is a wasteful number, since it uses less digits than its factorization.

20004450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899 (or 894 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 20004450 is about 4472.6334524528. The cubic root of 20004450 is about 271.4618920972.

Adding to 20004450 its reverse (5440002), we get a palindrome (25444452).

The spelling of 20004450 in words is "twenty million, four thousand, four hundred fifty".