20004421157765 has 32 divisors (see below), whose sum is σ = 27691693489152. Its totient is φ = 13735958976000.

The previous prime is 20004421157737. The next prime is 20004421157801. The reversal of 20004421157765 is 56775112440002.

It is a happy number.

It is not a de Polignac number, because 20004421157765 - 2⁴⁴ = 2412235113349 is a prime.

It is a congruent 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, 143013002 + ... + 143152811.

It is an arithmetic number, because the mean of its divisors is an integer number (865365421536).

Almost surely, 2^{20004421157765} is an apocalyptic number.

It is an amenable number.

20004421157765 is a deficient number, since it is larger than the sum of its proper divisors (7687272331387).

20004421157765 is a wasteful number, since it uses less digits than its factorization.

20004421157765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286165901.

The product of its (nonzero) digits is 470400, while the sum is 44.

Adding to 20004421157765 its reverse (56775112440002), we get a palindrome (76779533597767).

The spelling of 20004421157765 in words is "twenty trillion, four billion, four hundred twenty-one million, one hundred fifty-seven thousand, seven hundred sixty-five".