20120281 has 2 divisors, whose sum is σ = 20120282. Its totient is φ = 20120280.

The previous prime is 20120263. The next prime is 20120323. The reversal of 20120281 is 18202102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15280281 + 4840000 = 3909^2 + 2200^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120281 - 2⁷ = 20120153 is a prime.

It is a super-2 number, since 2×20120281² = 809651415037922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20120251) 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 as a sum of consecutive naturals, namely, 10060140 + 10060141.

It is an arithmetic number, because the mean of its divisors is an integer number (10060141).

Almost surely, 2^20120281 is an apocalyptic number.

It is an amenable number.

20120281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120281 is an equidigital number, since it uses as much as digits as its factorization.

20120281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 20120281 is about 4485.5636212186. The cubic root of 20120281 is about 271.9848292072.

Adding to 20120281 its reverse (18202102), we get a palindrome (38322383).

The spelling of 20120281 in words is "twenty million, one hundred twenty thousand, two hundred eighty-one".