20413205263505 has 32 divisors (see below), whose sum is σ = 26489961375360. Its totient is φ = 15048396380160.

The previous prime is 20413205263483. The next prime is 20413205263531. The reversal of 20413205263505 is 50536250231402.

It is not a de Polignac number, because 20413205263505 - 2⁶ = 20413205263441 is a prime.

It is a Curzon number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 10836737 + ... + 12580193.

It is an arithmetic number, because the mean of its divisors is an integer number (827811292980).

Almost surely, 2^{20413205263505} is an apocalyptic number.

It is an amenable number.

20413205263505 is a deficient number, since it is larger than the sum of its proper divisors (6076756111855).

20413205263505 is a wasteful number, since it uses less digits than its factorization.

20413205263505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746849.

The product of its (nonzero) digits is 216000, while the sum is 38.

Adding to 20413205263505 its reverse (50536250231402), we get a palindrome (70949455494907).

The spelling of 20413205263505 in words is "twenty trillion, four hundred thirteen billion, two hundred five million, two hundred sixty-three thousand, five hundred five".