20732717 has 2 divisors, whose sum is σ = 20732718. Its totient is φ = 20732716.

The previous prime is 20732693. The next prime is 20732737. The reversal of 20732717 is 71723702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20557156 + 175561 = 4534^2 + 419^2 .

It is a cyclic number.

It is not a de Polignac number, because 20732717 - 2¹⁸ = 20470573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20732717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20732737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10366358 + 10366359.

It is an arithmetic number, because the mean of its divisors is an integer number (10366359).

Almost surely, 2^20732717 is an apocalyptic number.

It is an amenable number.

20732717 is a deficient number, since it is larger than the sum of its proper divisors (1).

20732717 is an equidigital number, since it uses as much as digits as its factorization.

20732717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4116, while the sum is 29.

The square root of 20732717 is about 4553.3193386803. The cubic root of 20732717 is about 274.7169186171.

The spelling of 20732717 in words is "twenty million, seven hundred thirty-two thousand, seven hundred seventeen".