20555231135 has 4 divisors (see below), whose sum is σ = 24666277368. Its totient is φ = 16444184904.

The previous prime is 20555231129. The next prime is 20555231143. The reversal of 20555231135 is 53113255502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20555231135 - 2¹⁴ = 20555214751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2055523109 + ... + 2055523118.

It is an arithmetic number, because the mean of its divisors is an integer number (6166569342).

Almost surely, 2^20555231135 is an apocalyptic number.

20555231135 is a deficient number, since it is larger than the sum of its proper divisors (4111046233).

20555231135 is an equidigital number, since it uses as much as digits as its factorization.

20555231135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4111046232.

The product of its (nonzero) digits is 22500, while the sum is 32.

Adding to 20555231135 its reverse (53113255502), we get a palindrome (73668486637).

The spelling of 20555231135 in words is "twenty billion, five hundred fifty-five million, two hundred thirty-one thousand, one hundred thirty-five".