20000281 has 6 divisors (see below), whose sum is σ = 23265690. Its totient is φ = 17143056.

The previous prime is 20000269. The next prime is 20000287. The reversal of 20000281 is 18200002.

It can be written as a sum of positive squares in only one way, i.e., 18412681 + 1587600 = 4291^2 + 1260^2 .

It is not a de Polignac number, because 20000281 - 2⁷ = 20000153 is a prime.

It is a super-2 number, since 2×20000281² = 800022480157922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20000287) 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 5 ways as a sum of consecutive naturals, for example, 204036 + ... + 204133.

It is an arithmetic number, because the mean of its divisors is an integer number (3877615).

Almost surely, 2^20000281 is an apocalyptic number.

It is an amenable number.

20000281 is a deficient number, since it is larger than the sum of its proper divisors (3265409).

20000281 is an equidigital number, since it uses as much as digits as its factorization.

20000281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408183 (or 408176 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 20000281 is about 4472.1673716443. The cubic root of 20000281 is about 271.4430329058.

Adding to 20000281 its reverse (18200002), we get a palindrome (38200283).

The spelling of 20000281 in words is "twenty million, two hundred eighty-one", and thus it is an aban number.