20618956796849 has 8 divisors (see below), whose sum is σ = 21125685530880. Its totient is φ = 20112410317600.

The previous prime is 20618956796831. The next prime is 20618956796899. The reversal of 20618956796849 is 94869765981602.

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 20618956796849 - 2⁸ = 20618956796593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20618956796899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45334637 + ... + 45787194.

It is an arithmetic number, because the mean of its divisors is an integer number (2640710691360).

Almost surely, 2^{20618956796849} is an apocalyptic number.

It is an amenable number.

20618956796849 is a deficient number, since it is larger than the sum of its proper divisors (506728734031).

20618956796849 is an equidigital number, since it uses as much as digits as its factorization.

20618956796849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91127391.

The product of its (nonzero) digits is 2821754880, while the sum is 80.

The spelling of 20618956796849 in words is "twenty trillion, six hundred eighteen billion, nine hundred fifty-six million, seven hundred ninety-six thousand, eight hundred forty-nine".