20305386 has 24 divisors (see below), whose sum is σ = 44091684. Its totient is φ = 6753600.

The previous prime is 20305379. The next prime is 20305391. The reversal of 20305386 is 68350302.

It can be written as a sum of positive squares in 2 ways, for example, as 19053225 + 1252161 = 4365^2 + 1119^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9880 + ... + 11756.

Almost surely, 2^20305386 is an apocalyptic number.

20305386 is an abundant number, since it is smaller than the sum of its proper divisors (23786298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20305386 is a wasteful number, since it uses less digits than its factorization.

20305386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486 (or 2483 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 20305386 is about 4506.1497977764. The cubic root of 20305386 is about 272.8163640450.

Adding to 20305386 its reverse (68350302), we get a palindrome (88655688).

The spelling of 20305386 in words is "twenty million, three hundred five thousand, three hundred eighty-six".