20540405135331 has 8 divisors (see below), whose sum is σ = 30430229830160. Its totient is φ = 13693603423536.

The previous prime is 20540405135303. The next prime is 20540405135401. The reversal of 20540405135331 is 13353150404502.

20540405135331 is a `hidden beast` number, since 2 + 0 + 54 + 0 + 40 + 513 + 53 + 3 + 1 = 666.

It is not a de Polignac number, because 20540405135331 - 2⁹ = 20540405134819 is a prime.

It is a super-2 number, since 2×20540405135331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20540405135431) 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, 380377872850 + ... + 380377872903.

It is an arithmetic number, because the mean of its divisors is an integer number (3803778728770).

Almost surely, 2^{20540405135331} is an apocalyptic number.

20540405135331 is a deficient number, since it is larger than the sum of its proper divisors (9889824694829).

20540405135331 is an equidigital number, since it uses as much as digits as its factorization.

20540405135331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760755745762 (or 760755745756 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 20540405135331 its reverse (13353150404502), we get a palindrome (33893555539833).

The spelling of 20540405135331 in words is "twenty trillion, five hundred forty billion, four hundred five million, one hundred thirty-five thousand, three hundred thirty-one".