20629717 has 2 divisors, whose sum is σ = 20629718. Its totient is φ = 20629716.

The previous prime is 20629709. The next prime is 20629747. The reversal of 20629717 is 71792602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20124196 + 505521 = 4486^2 + 711^2 .

It is a cyclic number.

It is not a de Polignac number, because 20629717 - 2³ = 20629709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20629747) 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, 10314858 + 10314859.

It is an arithmetic number, because the mean of its divisors is an integer number (10314859).

Almost surely, 2^20629717 is an apocalyptic number.

It is an amenable number.

20629717 is a deficient number, since it is larger than the sum of its proper divisors (1).

20629717 is an equidigital number, since it uses as much as digits as its factorization.

20629717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 20629717 is about 4541.9948260649. The cubic root of 20629717 is about 274.2612325594.

The spelling of 20629717 in words is "twenty million, six hundred twenty-nine thousand, seven hundred seventeen".