20705381743021 has 8 divisors (see below), whose sum is σ = 22013268860160. Its totient is φ = 19431465719952.

The previous prime is 20705381743019. The next prime is 20705381743027. The reversal of 20705381743021 is 12034718350702.

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 20705381743021 - 2¹ = 20705381743019 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 (20705381743027) 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, 8492772261 + ... + 8492774698.

It is an arithmetic number, because the mean of its divisors is an integer number (2751658607520).

Almost surely, 2^{20705381743021} is an apocalyptic number.

It is an amenable number.

20705381743021 is a deficient number, since it is larger than the sum of its proper divisors (1307887117139).

20705381743021 is a wasteful number, since it uses less digits than its factorization.

20705381743021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16985547035.

The product of its (nonzero) digits is 282240, while the sum is 43.

The spelling of 20705381743021 in words is "twenty trillion, seven hundred five billion, three hundred eighty-one million, seven hundred forty-three thousand, twenty-one".