20227729 has 2 divisors, whose sum is σ = 20227730. Its totient is φ = 20227728.

The previous prime is 20227709. The next prime is 20227747. The reversal of 20227729 is 92772202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13337104 + 6890625 = 3652^2 + 2625^2 .

It is a cyclic number.

It is not a de Polignac number, because 20227729 - 2⁹ = 20227217 is a prime.

It is a super-2 number, since 2×20227729² = 818322040994882, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20227729.

It is not a weakly prime, because it can be changed into another prime (20227709) 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, 10113864 + 10113865.

It is an arithmetic number, because the mean of its divisors is an integer number (10113865).

Almost surely, 2^20227729 is an apocalyptic number.

It is an amenable number.

20227729 is a deficient number, since it is larger than the sum of its proper divisors (1).

20227729 is an equidigital number, since it uses as much as digits as its factorization.

20227729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 20227729 is about 4497.5247636895. The cubic root of 20227729 is about 272.4681285846.

The spelling of 20227729 in words is "twenty million, two hundred twenty-seven thousand, seven hundred twenty-nine".