20351645106242 has 16 divisors (see below), whose sum is σ = 33531314592960. Its totient is φ = 9221111512272.

The previous prime is 20351645106241. The next prime is 20351645106283. The reversal of 20351645106242 is 24260154615302.

It is a self number, because there is not a number n which added to its sum of digits gives 20351645106242.

It is not an unprimeable number, because it can be changed into a prime (20351645106241) 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, 11642816693 + ... + 11642818440.

It is an arithmetic number, because the mean of its divisors is an integer number (2095707162060).

Almost surely, 2^{20351645106242} is an apocalyptic number.

20351645106242 is a deficient number, since it is larger than the sum of its proper divisors (13179669486718).

20351645106242 is a wasteful number, since it uses less digits than its factorization.

20351645106242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23285635177.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 20351645106242 in words is "twenty trillion, three hundred fifty-one billion, six hundred forty-five million, one hundred six thousand, two hundred forty-two".