20351645106203 has 4 divisors (see below), whose sum is σ = 20507001175848. Its totient is φ = 20196289036560.

The previous prime is 20351645106193. The next prime is 20351645106229. The reversal of 20351645106203 is 30260154615302.

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 20351645106203 - 2¹⁰ = 20351645105179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20351645106283) 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 3 ways as a sum of consecutive naturals, for example, 77678034626 + ... + 77678034887.

It is an arithmetic number, because the mean of its divisors is an integer number (5126750293962).

Almost surely, 2^{20351645106203} is an apocalyptic number.

20351645106203 is a deficient number, since it is larger than the sum of its proper divisors (155356069645).

20351645106203 is a wasteful number, since it uses less digits than its factorization.

20351645106203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155356069644.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 20351645106203 in words is "twenty trillion, three hundred fifty-one billion, six hundred forty-five million, one hundred six thousand, two hundred three".