20643103 has 8 divisors (see below), whose sum is σ = 22314096. Its totient is φ = 18984000.

The previous prime is 20643061. The next prime is 20643107. The reversal of 20643103 is 30134602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20643103 - 2⁹ = 20642591 is a prime.

It is a super-2 number, since 2×20643103² = 852275402937218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20643107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 828 + ... + 6478.

It is an arithmetic number, because the mean of its divisors is an integer number (2789262).

Almost surely, 2^20643103 is an apocalyptic number.

20643103 is a deficient number, since it is larger than the sum of its proper divisors (1670993).

20643103 is a wasteful number, since it uses less digits than its factorization.

20643103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5945.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 20643103 is about 4543.4681687011. The cubic root of 20643103 is about 274.3205396759.

Adding to 20643103 its reverse (30134602), we get a palindrome (50777705).

The spelling of 20643103 in words is "twenty million, six hundred forty-three thousand, one hundred three".