20643501103 has 8 divisors (see below), whose sum is σ = 21341355728. Its totient is φ = 19955545344.

The previous prime is 20643501089. The next prime is 20643501133. The reversal of 20643501103 is 30110534602.

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 20643501103 - 2¹⁷ = 20643370031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20643501133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2470476 + ... + 2478817.

It is an arithmetic number, because the mean of its divisors is an integer number (2667669466).

Almost surely, 2^20643501103 is an apocalyptic number.

20643501103 is a deficient number, since it is larger than the sum of its proper divisors (697854625).

20643501103 is an equidigital number, since it uses as much as digits as its factorization.

20643501103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4949433.

The product of its (nonzero) digits is 2160, while the sum is 25.

The spelling of 20643501103 in words is "twenty billion, six hundred forty-three million, five hundred one thousand, one hundred three".