20681003 has 4 divisors (see below), whose sum is σ = 23635440. Its totient is φ = 17726568.

The previous prime is 20680997. The next prime is 20681009. The reversal of 20681003 is 30018602.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20680997) and next prime (20681009).

It is a cyclic number.

It is not a de Polignac number, because 20681003 - 2⁸ = 20680747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20681009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1477208 + ... + 1477221.

It is an arithmetic number, because the mean of its divisors is an integer number (5908860).

Almost surely, 2^20681003 is an apocalyptic number.

20681003 is a deficient number, since it is larger than the sum of its proper divisors (2954437).

20681003 is an equidigital number, since it uses as much as digits as its factorization.

20681003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2954436.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 20681003 is about 4547.6370787476. The cubic root of 20681003 is about 274.4883179446.

Adding to 20681003 its reverse (30018602), we get a palindrome (50699605).

The spelling of 20681003 in words is "twenty million, six hundred eighty-one thousand, three".