20229761 has 2 divisors, whose sum is σ = 20229762. Its totient is φ = 20229760.

The previous prime is 20229757. The next prime is 20229793. The reversal of 20229761 is 16792202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18490000 + 1739761 = 4300^2 + 1319^2 .

It is a cyclic number.

It is not a de Polignac number, because 20229761 - 2² = 20229757 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20229721) 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, 10114880 + 10114881.

It is an arithmetic number, because the mean of its divisors is an integer number (10114881).

Almost surely, 2^20229761 is an apocalyptic number.

It is an amenable number.

20229761 is a deficient number, since it is larger than the sum of its proper divisors (1).

20229761 is an equidigital number, since it uses as much as digits as its factorization.

20229761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 20229761 is about 4497.7506600522. The cubic root of 20229761 is about 272.4772519798.

The spelling of 20229761 in words is "twenty million, two hundred twenty-nine thousand, seven hundred sixty-one".