20432280 has 128 divisors (see below), whose sum is σ = 69880320. Its totient is φ = 4730880.

The previous prime is 20432273. The next prime is 20432287. The reversal of 20432280 is 8223402.

It is an interprime number because it is at equal distance from previous prime (20432273) and next prime (20432287).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20432287) 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 31 ways as a sum of consecutive naturals, for example, 30024 + ... + 30696.

It is an arithmetic number, because the mean of its divisors is an integer number (545940).

Almost surely, 2^20432280 is an apocalyptic number.

20432280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20432280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34940160).

20432280 is an abundant number, since it is smaller than the sum of its proper divisors (49448040).

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

20432280 is a wasteful number, since it uses less digits than its factorization.

20432280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721 (or 717 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 20432280 is about 4520.2079598178. The cubic root of 20432280 is about 273.3834860711.

Adding to 20432280 its reverse (8223402), we get a palindrome (28655682).

It can be divided in two parts, 204322 and 80, that added together give a palindrome (204402).

The spelling of 20432280 in words is "twenty million, four hundred thirty-two thousand, two hundred eighty".