20227281 has 8 divisors (see below), whose sum is σ = 28142400. Its totient is φ = 12898512.

The previous prime is 20227279. The next prime is 20227303. The reversal of 20227281 is 18272202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20227281 - 2¹ = 20227279 is a prime.

It is a super-2 number, since 2×20227281² = 818285793305922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20227231) 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, 146506 + ... + 146643.

It is an arithmetic number, because the mean of its divisors is an integer number (3517800).

Almost surely, 2^20227281 is an apocalyptic number.

It is an amenable number.

20227281 is a deficient number, since it is larger than the sum of its proper divisors (7915119).

20227281 is a wasteful number, since it uses less digits than its factorization.

20227281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293175.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20227281 is about 4497.4749582405. The cubic root of 20227281 is about 272.4661170452.

Adding to 20227281 its reverse (18272202), we get a palindrome (38499483).

The spelling of 20227281 in words is "twenty million, two hundred twenty-seven thousand, two hundred eighty-one".