20660351100203 has 4 divisors (see below), whose sum is σ = 21372777000240. Its totient is φ = 19947925200168.

The previous prime is 20660351100131. The next prime is 20660351100229. The reversal of 20660351100203 is 30200115306602.

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

It is a cyclic number.

It is not a de Polignac number, because 20660351100203 - 2⁴² = 16262304589099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 712425900007 = 20660351100203 / (2 + 0 + 6 + 6 + 0 + 3 + 5 + 1 + 1 + 0 + 0 + 2 + 0 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20660351100283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356212949975 + ... + 356212950032.

It is an arithmetic number, because the mean of its divisors is an integer number (5343194250060).

Almost surely, 2^{20660351100203} is an apocalyptic number.

20660351100203 is a deficient number, since it is larger than the sum of its proper divisors (712425900037).

20660351100203 is an equidigital number, since it uses as much as digits as its factorization.

20660351100203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712425900036.

The product of its (nonzero) digits is 6480, while the sum is 29.

Adding to 20660351100203 its reverse (30200115306602), we get a palindrome (50860466406805).

The spelling of 20660351100203 in words is "twenty trillion, six hundred sixty billion, three hundred fifty-one million, one hundred thousand, two hundred three".