20556644241540 has 48 divisors (see below), whose sum is σ = 62791204230720. Its totient is φ = 4983428906880.

The previous prime is 20556644241521. The next prime is 20556644241563. The reversal of 20556644241540 is 4514244665502.

It is a self number, because there is not a number n which added to its sum of digits gives 20556644241540.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15573214675 + ... + 15573215994.

It is an arithmetic number, because the mean of its divisors is an integer number (1308150088140).

Almost surely, 2^{20556644241540} is an apocalyptic number.

20556644241540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20556644241540 is an abundant number, since it is smaller than the sum of its proper divisors (42234559989180).

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

20556644241540 is a wasteful number, since it uses less digits than its factorization.

20556644241540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31146430692 (or 31146430690 counting only the distinct ones).

The product of its (nonzero) digits is 4608000, while the sum is 48.

The spelling of 20556644241540 in words is "twenty trillion, five hundred fifty-six billion, six hundred forty-four million, two hundred forty-one thousand, five hundred forty".