20229709 has 2 divisors, whose sum is σ = 20229710. Its totient is φ = 20229708.

The previous prime is 20229667. The next prime is 20229721. The reversal of 20229709 is 90792202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18679684 + 1550025 = 4322^2 + 1245^2 .

It is a cyclic number.

It is not a de Polignac number, because 20229709 - 2⁹ = 20229197 is a prime.

It is a super-2 number, since 2×20229709² = 818482252449362, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20229799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10114854 + 10114855.

It is an arithmetic number, because the mean of its divisors is an integer number (10114855).

Almost surely, 2^20229709 is an apocalyptic number.

It is an amenable number.

20229709 is a deficient number, since it is larger than the sum of its proper divisors (1).

20229709 is an equidigital number, since it uses as much as digits as its factorization.

20229709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 20229709 is about 4497.7448793812. The cubic root of 20229709 is about 272.4770185147.

The spelling of 20229709 in words is "twenty million, two hundred twenty-nine thousand, seven hundred nine".