20043450 has 180 divisors, whose sum is σ = 65424942. Its totient is φ = 4536000.

The previous prime is 20043433. The next prime is 20043451. The reversal of 20043450 is 5434002.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 18896409 + 1147041 = 4347^2 + 1071^2 .

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 (20043451) by changing a digit.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 198400 + ... + 198500.

Almost surely, 2^20043450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20043450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32712471).

20043450 is an abundant number, since it is smaller than the sum of its proper divisors (45381492).

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

20043450 is a wasteful number, since it uses less digits than its factorization.

20043450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 20043450 is about 4476.9911771188. The cubic root of 20043450 is about 271.6381885580.

Adding to 20043450 its reverse (5434002), we get a palindrome (25477452).

The spelling of 20043450 in words is "twenty million, forty-three thousand, four hundred fifty".