20781409044383 has 16 divisors (see below), whose sum is σ = 23561539854720. Its totient is φ = 18170386982496.

The previous prime is 20781409044299. The next prime is 20781409044391. The reversal of 20781409044383 is 38344090418702.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20781409044383 - 2⁸ = 20781409044127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20781409044083) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4957985 + ... + 8132922.

It is an arithmetic number, because the mean of its divisors is an integer number (1472596240920).

Almost surely, 2^{20781409044383} is an apocalyptic number.

20781409044383 is a deficient number, since it is larger than the sum of its proper divisors (2780130810337).

20781409044383 is a wasteful number, since it uses less digits than its factorization.

20781409044383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13097366.

The product of its (nonzero) digits is 4644864, while the sum is 53.

The spelling of 20781409044383 in words is "twenty trillion, seven hundred eighty-one billion, four hundred nine million, forty-four thousand, three hundred eighty-three".