20051729 has 2 divisors, whose sum is σ = 20051730. Its totient is φ = 20051728.

The previous prime is 20051711. The next prime is 20051767. The reversal of 20051729 is 92715002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19492225 + 559504 = 4415^2 + 748^2 .

It is a cyclic number.

It is not a de Polignac number, because 20051729 - 2¹² = 20047633 is a prime.

It is equal to p_1273715 and since 20051729 and 1273715 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 20051698 and 20051707.

It is not a weakly prime, because it can be changed into another prime (20051329) 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, 10025864 + 10025865.

It is an arithmetic number, because the mean of its divisors is an integer number (10025865).

Almost surely, 2^20051729 is an apocalyptic number.

It is an amenable number.

20051729 is a deficient number, since it is larger than the sum of its proper divisors (1).

20051729 is an equidigital number, since it uses as much as digits as its factorization.

20051729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 20051729 is about 4477.9156981792. The cubic root of 20051729 is about 271.6755837004.

The spelling of 20051729 in words is "twenty million, fifty-one thousand, seven hundred twenty-nine".