20321053555 has 16 divisors (see below), whose sum is σ = 26606145888. Its totient is φ = 14776704000.

The previous prime is 20321053549. The next prime is 20321053559. The reversal of 20321053555 is 55535012302.

It is not a de Polignac number, because 20321053555 - 2¹³ = 20321045363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20321053559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394915 + ... + 443395.

It is an arithmetic number, because the mean of its divisors is an integer number (1662884118).

Almost surely, 2^20321053555 is an apocalyptic number.

20321053555 is a deficient number, since it is larger than the sum of its proper divisors (6285092333).

20321053555 is a wasteful number, since it uses less digits than its factorization.

20321053555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56118.

The product of its (nonzero) digits is 22500, while the sum is 31.

Adding to 20321053555 its reverse (55535012302), we get a palindrome (75856065857).

The spelling of 20321053555 in words is "twenty billion, three hundred twenty-one million, fifty-three thousand, five hundred fifty-five".