20344646543661 has 96 divisors (see below), whose sum is σ = 36924332054400. Its totient is φ = 10994010508800.

The previous prime is 20344646543659. The next prime is 20344646543693. The reversal of 20344646543661 is 16634564644302.

20344646543661 is a `hidden beast` number, since 2 + 0 + 34 + 4 + 6 + 4 + 6 + 543 + 6 + 61 = 666.

It is not a de Polignac number, because 20344646543661 - 2¹ = 20344646543659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20344646543598 and 20344646543607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20344646553661) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8584570 + ... + 10695051.

It is an arithmetic number, because the mean of its divisors is an integer number (384628458900).

Almost surely, 2^{20344646543661} is an apocalyptic number.

It is an amenable number.

20344646543661 is a deficient number, since it is larger than the sum of its proper divisors (16579685510739).

20344646543661 is a wasteful number, since it uses less digits than its factorization.

20344646543661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19279688 (or 19279671 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 54.

The spelling of 20344646543661 in words is "twenty trillion, three hundred forty-four billion, six hundred forty-six million, five hundred forty-three thousand, six hundred sixty-one".