20445165161644 has 12 divisors (see below), whose sum is σ = 35779070855304. Its totient is φ = 10222573488704.

The previous prime is 20445165161623. The next prime is 20445165161651. The reversal of 20445165161644 is 44616156154402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6896679 + ... + 9405025.

It is an arithmetic number, because the mean of its divisors is an integer number (2981589237942).

Almost surely, 2^{20445165161644} is an apocalyptic number.

It is an amenable number.

20445165161644 is a deficient number, since it is larger than the sum of its proper divisors (15333905693660).

20445165161644 is a wasteful number, since it uses less digits than its factorization.

20445165161644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546064 (or 4546062 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 49.

The spelling of 20445165161644 in words is "twenty trillion, four hundred forty-five billion, one hundred sixty-five million, one hundred sixty-one thousand, six hundred forty-four".