20550265001644 has 72 divisors (see below), whose sum is σ = 42246927469152. Its totient is φ = 8568096606720.

The previous prime is 20550265001621. The next prime is 20550265001711. The reversal of 20550265001644 is 44610056205502.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20550265001597 and 20550265001606.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 332729214 + ... + 332790970.

It is an arithmetic number, because the mean of its divisors is an integer number (586762881516).

Almost surely, 2^{20550265001644} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20550265001644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21123463734576).

20550265001644 is an abundant number, since it is smaller than the sum of its proper divisors (21696662467508).

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

20550265001644 is a wasteful number, since it uses less digits than its factorization.

20550265001644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70523 (or 70484 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 20550265001644 in words is "twenty trillion, five hundred fifty billion, two hundred sixty-five million, one thousand, six hundred forty-four".