20305693 has 2 divisors, whose sum is σ = 20305694. Its totient is φ = 20305692.

The previous prime is 20305673. The next prime is 20305777. The reversal of 20305693 is 39650302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13741849 + 6563844 = 3707^2 + 2562^2 .

It is a cyclic number.

It is not a de Polignac number, because 20305693 - 2¹⁷ = 20174621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20305603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10152846 + 10152847.

It is an arithmetic number, because the mean of its divisors is an integer number (10152847).

Almost surely, 2^20305693 is an apocalyptic number.

It is an amenable number.

20305693 is a deficient number, since it is larger than the sum of its proper divisors (1).

20305693 is an equidigital number, since it uses as much as digits as its factorization.

20305693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 20305693 is about 4506.1838622054. The cubic root of 20305693 is about 272.8177389545.

Adding to 20305693 its reverse (39650302), we get a palindrome (59955995).

The spelling of 20305693 in words is "twenty million, three hundred five thousand, six hundred ninety-three".