20801636261541 has 6 divisors (see below), whose sum is σ = 30046807933350. Its totient is φ = 13867757507688.

The previous prime is 20801636261501. The next prime is 20801636261591. The reversal of 20801636261541 is 14516263610802.

20801636261541 is a `hidden beast` number, since 2 + 0 + 8 + 0 + 1 + 6 + 3 + 626 + 15 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16904604933441 + 3897031328100 = 4111521^2 + 1974090^2 .

It is not a de Polignac number, because 20801636261541 - 2²⁹ = 20801099390629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20801636261501) 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 5 ways as a sum of consecutive naturals, for example, 1155646458966 + ... + 1155646458983.

It is an arithmetic number, because the mean of its divisors is an integer number (5007801322225).

Almost surely, 2^{20801636261541} is an apocalyptic number.

It is an amenable number.

20801636261541 is a deficient number, since it is larger than the sum of its proper divisors (9245171671809).

20801636261541 is a wasteful number, since it uses less digits than its factorization.

20801636261541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311292917955 (or 2311292917952 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 20801636261541 in words is "twenty trillion, eight hundred one billion, six hundred thirty-six million, two hundred sixty-one thousand, five hundred forty-one".