20844340627961 has 8 divisors (see below), whose sum is σ = 21330765249024. Its totient is φ = 20357992030320.

The previous prime is 20844340627933. The next prime is 20844340627997. The reversal of 20844340627961 is 16972604344802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20844340627961 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20844340627897 and 20844340627906.

It is not an unprimeable number, because it can be changed into a prime (20844340629961) 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, 18450905 + ... + 19548006.

It is an arithmetic number, because the mean of its divisors is an integer number (2666345656128).

Almost surely, 2^{20844340627961} is an apocalyptic number.

It is an amenable number.

20844340627961 is a deficient number, since it is larger than the sum of its proper divisors (486424621063).

20844340627961 is a wasteful number, since it uses less digits than its factorization.

20844340627961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38011711.

The product of its (nonzero) digits is 13934592, while the sum is 56.

The spelling of 20844340627961 in words is "twenty trillion, eight hundred forty-four billion, three hundred forty million, six hundred twenty-seven thousand, nine hundred sixty-one".