20684693 has 2 divisors, whose sum is σ = 20684694. Its totient is φ = 20684692.

The previous prime is 20684669. The next prime is 20684717. The reversal of 20684693 is 39648602.

It is a balanced prime because it is at equal distance from previous prime (20684669) and next prime (20684717).

It can be written as a sum of positive squares in only one way, i.e., 15311569 + 5373124 = 3913^2 + 2318^2 .

It is a cyclic number.

It is not a de Polignac number, because 20684693 - 2⁸ = 20684437 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20684663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10342346 + 10342347.

It is an arithmetic number, because the mean of its divisors is an integer number (10342347).

Almost surely, 2^20684693 is an apocalyptic number.

It is an amenable number.

20684693 is a deficient number, since it is larger than the sum of its proper divisors (1).

20684693 is an equidigital number, since it uses as much as digits as its factorization.

20684693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 20684693 is about 4548.0427658499. The cubic root of 20684693 is about 274.5046421313.

The spelling of 20684693 in words is "twenty million, six hundred eighty-four thousand, six hundred ninety-three".