20013773240581 has 2 divisors, whose sum is σ = 20013773240582. Its totient is φ = 20013773240580.

The previous prime is 20013773240567. The next prime is 20013773240621. The reversal of 20013773240581 is 18504237731002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19836254271681 + 177518968900 = 4453791^2 + 421330^2 .

It is a cyclic number.

It is not a de Polignac number, because 20013773240581 - 2¹³ = 20013773232389 is a prime.

It is a super-2 number, since 2×20013773240581² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20013773280581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006886620290 + 10006886620291.

It is an arithmetic number, because the mean of its divisors is an integer number (10006886620291).

Almost surely, 2^{20013773240581} is an apocalyptic number.

It is an amenable number.

20013773240581 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013773240581 is an equidigital number, since it uses as much as digits as its factorization.

20013773240581 is an evil number, because the sum of its binary digits is even.

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

The spelling of 20013773240581 in words is "twenty trillion, thirteen billion, seven hundred seventy-three million, two hundred forty thousand, five hundred eighty-one".