20355316230665 has 32 divisors (see below), whose sum is σ = 27731633319936. Its totient is φ = 14237222330880.

The previous prime is 20355316230649. The next prime is 20355316230673. The reversal of 20355316230665 is 56603261355302.

It is a happy number.

It is not a de Polignac number, because 20355316230665 - 2⁴ = 20355316230649 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

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, 107372252 + ... + 107561661.

It is an arithmetic number, because the mean of its divisors is an integer number (866613541248).

Almost surely, 2^{20355316230665} is an apocalyptic number.

It is an amenable number.

20355316230665 is a deficient number, since it is larger than the sum of its proper divisors (7376317089271).

20355316230665 is a wasteful number, since it uses less digits than its factorization.

20355316230665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214934009.

The product of its (nonzero) digits is 2916000, while the sum is 47.

Adding to 20355316230665 its reverse (56603261355302), we get a palindrome (76958577585967).

The spelling of 20355316230665 in words is "twenty trillion, three hundred fifty-five billion, three hundred sixteen million, two hundred thirty thousand, six hundred sixty-five".