20556767720100 has 36 divisors (see below), whose sum is σ = 59477581271024. Its totient is φ = 5481804725280.

The previous prime is 20556767720089. The next prime is 20556767720107. The reversal of 20556767720100 is 102776765502.

It is a self number, because there is not a number n which added to its sum of digits gives 20556767720100.

It is not an unprimeable number, because it can be changed into a prime (20556767720107) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 34261279234 + ... + 34261279833.

Almost surely, 2^{20556767720100} is an apocalyptic number.

20556767720100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20556767720100 is an abundant number, since it is smaller than the sum of its proper divisors (38920813550924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20556767720100 is a wasteful number, since it uses less digits than its factorization.

20556767720100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68522559084 (or 68522559077 counting only the distinct ones).

The product of its (nonzero) digits is 1234800, while the sum is 48.

The spelling of 20556767720100 in words is "twenty trillion, five hundred fifty-six billion, seven hundred sixty-seven million, seven hundred twenty thousand, one hundred".