20680263 has 6 divisors (see below), whose sum is σ = 29871504. Its totient is φ = 13786836.

The previous prime is 20680259. The next prime is 20680271. The reversal of 20680263 is 36208602.

It is not a de Polignac number, because 20680263 - 2² = 20680259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20680213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1148895 + ... + 1148912.

It is an arithmetic number, because the mean of its divisors is an integer number (4978584).

Almost surely, 2^20680263 is an apocalyptic number.

20680263 is a deficient number, since it is larger than the sum of its proper divisors (9191241).

20680263 is a wasteful number, since it uses less digits than its factorization.

20680263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2297813 (or 2297810 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20680263 is about 4547.5557170858. Note that the first 3 decimals coincide. The cubic root of 20680263 is about 274.4850440257.

Adding to 20680263 its reverse (36208602), we get a palindrome (56888865).

The spelling of 20680263 in words is "twenty million, six hundred eighty thousand, two hundred sixty-three".