20446729 has 2 divisors, whose sum is σ = 20446730. Its totient is φ = 20446728.

The previous prime is 20446721. The next prime is 20446799. The reversal of 20446729 is 92764402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20385225 + 61504 = 4515^2 + 248^2 .

It is a cyclic number.

It is not a de Polignac number, because 20446729 - 2³ = 20446721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20446694 and 20446703.

It is not a weakly prime, because it can be changed into another prime (20446721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10223364 + 10223365.

It is an arithmetic number, because the mean of its divisors is an integer number (10223365).

Almost surely, 2^20446729 is an apocalyptic number.

It is an amenable number.

20446729 is a deficient number, since it is larger than the sum of its proper divisors (1).

20446729 is an equidigital number, since it uses as much as digits as its factorization.

20446729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 20446729 is about 4521.8059445315. The cubic root of 20446729 is about 273.4479133275.

The spelling of 20446729 in words is "twenty million, four hundred forty-six thousand, seven hundred twenty-nine".