20432250 has 80 divisors (see below), whose sum is σ = 57194280. Its totient is φ = 5443200.

The previous prime is 20432233. The next prime is 20432261. The reversal of 20432250 is 5223402.

It can be written as a sum of positive squares in 4 ways, for example, as 4247721 + 16184529 = 2061^2 + 4023^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 19746 + ... + 20754.

Almost surely, 2^20432250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20432250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28597140).

20432250 is an abundant number, since it is smaller than the sum of its proper divisors (36762030).

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

20432250 is a wasteful number, since it uses less digits than its factorization.

20432250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038 (or 1019 counting only the distinct ones).

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

The square root of 20432250 is about 4520.2046413852. The cubic root of 20432250 is about 273.3833522712.

Adding to 20432250 its reverse (5223402), we get a palindrome (25655652).

The spelling of 20432250 in words is "twenty million, four hundred thirty-two thousand, two hundred fifty".