20695729 has 2 divisors, whose sum is σ = 20695730. Its totient is φ = 20695728.

The previous prime is 20695711. The next prime is 20695747. The reversal of 20695729 is 92759602.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (20695711) and next prime (20695747).

It can be written as a sum of positive squares in only one way, i.e., 19158129 + 1537600 = 4377^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 20695729 - 2⁷ = 20695601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20695691 and 20695700.

It is not a weakly prime, because it can be changed into another prime (20695789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10347864 + 10347865.

It is an arithmetic number, because the mean of its divisors is an integer number (10347865).

Almost surely, 2^20695729 is an apocalyptic number.

It is an amenable number.

20695729 is a deficient number, since it is larger than the sum of its proper divisors (1).

20695729 is an equidigital number, since it uses as much as digits as its factorization.

20695729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 20695729 is about 4549.2558732171. The cubic root of 20695729 is about 274.5534526957.

The spelling of 20695729 in words is "twenty million, six hundred ninety-five thousand, seven hundred twenty-nine".