20842866862642 has 64 divisors (see below), whose sum is σ = 34646211855360. Its totient is φ = 9325242712000.

The previous prime is 20842866862633. The next prime is 20842866862661. The reversal of 20842866862642 is 24626866824802.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2705807763 + ... + 2705815465.

It is an arithmetic number, because the mean of its divisors is an integer number (541347060240).

Almost surely, 2^{20842866862642} is an apocalyptic number.

20842866862642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20842866862642 is a deficient number, since it is larger than the sum of its proper divisors (13803344992718).

20842866862642 is a wasteful number, since it uses less digits than its factorization.

20842866862642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14799.

The product of its (nonzero) digits is 169869312, while the sum is 64.

The spelling of 20842866862642 in words is "twenty trillion, eight hundred forty-two billion, eight hundred sixty-six million, eight hundred sixty-two thousand, six hundred forty-two".