20463281 has 4 divisors (see below), whose sum is σ = 20473332. Its totient is φ = 20453232.

The previous prime is 20463271. The next prime is 20463293. The reversal of 20463281 is 18236402.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7789681 + 12673600 = 2791^2 + 3560^2 .

It is a cyclic number.

It is not a de Polignac number, because 20463281 - 2¹⁴ = 20446897 is a prime.

It is a super-2 number, since 2×20463281² = 837491738569922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20463281.

It is not an unprimeable number, because it can be changed into a prime (20463221) 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 3 ways as a sum of consecutive naturals, for example, 770 + ... + 6443.

It is an arithmetic number, because the mean of its divisors is an integer number (5118333).

Almost surely, 2^20463281 is an apocalyptic number.

It is an amenable number.

20463281 is a deficient number, since it is larger than the sum of its proper divisors (10051).

20463281 is an equidigital number, since it uses as much as digits as its factorization.

20463281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10050.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20463281 is about 4523.6358164645. The cubic root of 20463281 is about 273.5216804500.

Adding to 20463281 its reverse (18236402), we get a palindrome (38699683).

The spelling of 20463281 in words is "twenty million, four hundred sixty-three thousand, two hundred eighty-one".