20321136356105 has 16 divisors (see below), whose sum is σ = 26266975059024. Its totient is φ = 15003055200000.

The previous prime is 20321136356099. The next prime is 20321136356153. The reversal of 20321136356105 is 50165363112302.

It can be written as a sum of positive squares in 8 ways, for example, as 12057374251129 + 8263762104976 = 3472373^2 + 2874676^2 .

It is not a de Polignac number, because 20321136356105 - 2⁴ = 20321136356089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34312646 + ... + 34899855.

It is an arithmetic number, because the mean of its divisors is an integer number (1641685941189).

Almost surely, 2^{20321136356105} is an apocalyptic number.

It is an amenable number.

20321136356105 is a deficient number, since it is larger than the sum of its proper divisors (5945838702919).

20321136356105 is a wasteful number, since it uses less digits than its factorization.

20321136356105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69217036.

The product of its (nonzero) digits is 97200, while the sum is 38.

Adding to 20321136356105 its reverse (50165363112302), we get a palindrome (70486499468407).

The spelling of 20321136356105 in words is "twenty trillion, three hundred twenty-one billion, one hundred thirty-six million, three hundred fifty-six thousand, one hundred five".