20511445355011 has 16 divisors (see below), whose sum is σ = 23793188106240. Its totient is φ = 17526232294560.

The previous prime is 20511445354993. The next prime is 20511445355039. The reversal of 20511445355011 is 11055354411502.

It is a cyclic number.

It is not a de Polignac number, because 20511445355011 - 2¹¹ = 20511445352963 is a prime.

It is a super-4 number, since 4×20511445355011⁴ (a number of 54 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20511445359011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1106444791 + ... + 1106463328.

It is an arithmetic number, because the mean of its divisors is an integer number (1487074256640).

Almost surely, 2^{20511445355011} is an apocalyptic number.

20511445355011 is a deficient number, since it is larger than the sum of its proper divisors (3281742751229).

20511445355011 is a wasteful number, since it uses less digits than its factorization.

20511445355011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2212908186.

The product of its (nonzero) digits is 60000, while the sum is 37.

Adding to 20511445355011 its reverse (11055354411502), we get a palindrome (31566799766513).

The spelling of 20511445355011 in words is "twenty trillion, five hundred eleven billion, four hundred forty-five million, three hundred fifty-five thousand, eleven".