20953584508505 has 48 divisors (see below), whose sum is σ = 28596178699200. Its totient is φ = 14710815504000.

The previous prime is 20953584508481. The next prime is 20953584508511. The reversal of 20953584508505 is 50580548535902.

It is not a de Polignac number, because 20953584508505 - 2²² = 20953580314201 is a prime.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 99041126 + ... + 99252464.

It is an arithmetic number, because the mean of its divisors is an integer number (595753722900).

Almost surely, 2^{20953584508505} is an apocalyptic number.

It is an amenable number.

20953584508505 is a deficient number, since it is larger than the sum of its proper divisors (7642594190695).

20953584508505 is a wasteful number, since it uses less digits than its factorization.

20953584508505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217046 (or 217035 counting only the distinct ones).

The product of its (nonzero) digits is 43200000, while the sum is 59.

The spelling of 20953584508505 in words is "twenty trillion, nine hundred fifty-three billion, five hundred eighty-four million, five hundred eight thousand, five hundred five".