20555563421188 has 24 divisors (see below), whose sum is σ = 35978706372672. Its totient is φ = 10275933242784.

The previous prime is 20555563421179. The next prime is 20555563421249. The reversal of 20555563421188 is 88112436555502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 904444281 + ... + 904467007.

It is an arithmetic number, because the mean of its divisors is an integer number (1499112765528).

Almost surely, 2^{20555563421188} is an apocalyptic number.

It is an amenable number.

20555563421188 is a deficient number, since it is larger than the sum of its proper divisors (15423142951484).

20555563421188 is a wasteful number, since it uses less digits than its factorization.

20555563421188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53451 (or 53449 counting only the distinct ones).

The product of its (nonzero) digits is 11520000, while the sum is 55.

The spelling of 20555563421188 in words is "twenty trillion, five hundred fifty-five billion, five hundred sixty-three million, four hundred twenty-one thousand, one hundred eighty-eight".