20844335997381 has 16 divisors (see below), whose sum is σ = 31231647248256. Its totient is φ = 12269575703616.

The previous prime is 20844335997341. The next prime is 20844335997409. The reversal of 20844335997381 is 18379953344802.

It is not a de Polignac number, because 20844335997381 - 2¹⁴ = 20844335980997 is a prime.

It is a super-2 number, since 2×20844335997381² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20844335997341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11618915490 + ... + 11618917283.

It is an arithmetic number, because the mean of its divisors is an integer number (1951977953016).

Almost surely, 2^{20844335997381} is an apocalyptic number.

It is an amenable number.

20844335997381 is a deficient number, since it is larger than the sum of its proper divisors (10387311250875).

20844335997381 is a wasteful number, since it uses less digits than its factorization.

20844335997381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23237832812.

The product of its (nonzero) digits is 156764160, while the sum is 66.

The spelling of 20844335997381 in words is "twenty trillion, eight hundred forty-four billion, three hundred thirty-five million, nine hundred ninety-seven thousand, three hundred eighty-one".