20550564243642 has 16 divisors (see below), whose sum is σ = 41101819038432. Its totient is φ = 6850072989360.

The previous prime is 20550564243631. The next prime is 20550564243647. The reversal of 20550564243642 is 24634246505502.

It is a junction number, because it is equal to n+sod(n) for n = 20550564243591 and 20550564243600.

It is not an unprimeable number, because it can be changed into a prime (20550564243647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28385688 + ... + 29100659.

It is an arithmetic number, because the mean of its divisors is an integer number (2568863689902).

Almost surely, 2^{20550564243642} is an apocalyptic number.

20550564243642 is an abundant number, since it is smaller than the sum of its proper divisors (20551254794790).

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

20550564243642 is a wasteful number, since it uses less digits than its factorization.

20550564243642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57545933.

The product of its (nonzero) digits is 6912000, while the sum is 48.

The spelling of 20550564243642 in words is "twenty trillion, five hundred fifty billion, five hundred sixty-four million, two hundred forty-three thousand, six hundred forty-two".