20013124161555 has 48 divisors (see below), whose sum is σ = 39654274855104. Its totient is φ = 9146727014400.

The previous prime is 20013124161449. The next prime is 20013124161629. The reversal of 20013124161555 is 55516142131002.

20013124161555 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 3 + 1 + 2 + 41 + 61 + 555 = 666.

It is not a de Polignac number, because 20013124161555 - 2⁸ = 20013124161299 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6039246 + ... + 8746355.

It is an arithmetic number, because the mean of its divisors is an integer number (826130726148).

Almost surely, 2^{20013124161555} is an apocalyptic number.

20013124161555 is a deficient number, since it is larger than the sum of its proper divisors (19641150693549).

20013124161555 is a wasteful number, since it uses less digits than its factorization.

20013124161555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14789916 (or 14789913 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

Adding to 20013124161555 its reverse (55516142131002), we get a palindrome (75529266292557).

The spelling of 20013124161555 in words is "twenty trillion, thirteen billion, one hundred twenty-four million, one hundred sixty-one thousand, five hundred fifty-five".