20442281 has 2 divisors, whose sum is σ = 20442282. Its totient is φ = 20442280.

The previous prime is 20442269. The next prime is 20442293. The reversal of 20442281 is 18224402.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (20442269) and next prime (20442293).

It can be written as a sum of positive squares in only one way, i.e., 20430400 + 11881 = 4520^2 + 109^2 .

It is a cyclic number.

It is not a de Polignac number, because 20442281 - 2¹⁰ = 20441257 is a prime.

It is a super-2 number, since 2×20442281² = 835773704965922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20442581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221140 + 10221141.

It is an arithmetic number, because the mean of its divisors is an integer number (10221141).

Almost surely, 2^20442281 is an apocalyptic number.

It is an amenable number.

20442281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442281 is an equidigital number, since it uses as much as digits as its factorization.

20442281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 20442281 is about 4521.3140788934. The cubic root of 20442281 is about 273.4280831870.

Adding to 20442281 its reverse (18224402), we get a palindrome (38666683).

The spelling of 20442281 in words is "twenty million, four hundred forty-two thousand, two hundred eighty-one".