20004421135577 has 4 divisors (see below), whose sum is σ = 20099228818896. Its totient is φ = 19909613452260.

The previous prime is 20004421135553. The next prime is 20004421135579. The reversal of 20004421135577 is 77553112440002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20004421135577 - 2¹⁰ = 20004421134553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20004421135579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47403841343 + ... + 47403841764.

It is an arithmetic number, because the mean of its divisors is an integer number (5024807204724).

Almost surely, 2^{20004421135577} is an apocalyptic number.

It is an amenable number.

20004421135577 is a deficient number, since it is larger than the sum of its proper divisors (94807683319).

20004421135577 is an equidigital number, since it uses as much as digits as its factorization.

20004421135577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94807683318.

The product of its (nonzero) digits is 235200, while the sum is 41.

Adding to 20004421135577 its reverse (77553112440002), we get a palindrome (97557533575579).

The spelling of 20004421135577 in words is "twenty trillion, four billion, four hundred twenty-one million, one hundred thirty-five thousand, five hundred seventy-seven".