20243280 has 40 divisors (see below), whose sum is σ = 62754912. Its totient is φ = 5398144.

The previous prime is 20243269. The next prime is 20243287. The reversal of 20243280 is 8234202.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20243287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41934 + ... + 42413.

Almost surely, 2^20243280 is an apocalyptic number.

20243280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20243280 is an abundant number, since it is smaller than the sum of its proper divisors (42511632).

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

20243280 is a wasteful number, since it uses less digits than its factorization.

20243280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84363 (or 84357 counting only the distinct ones).

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

The square root of 20243280 is about 4499.2532713774. The cubic root of 20243280 is about 272.5379348473.

Adding to 20243280 its reverse (8234202), we get a palindrome (28477482).

The spelling of 20243280 in words is "twenty million, two hundred forty-three thousand, two hundred eighty".