20028854670728 has 36 divisors (see below), whose sum is σ = 38181307973445. Its totient is φ = 9849876648480.

The previous prime is 20028854670709. The next prime is 20028854670763. The reversal of 20028854670728 is 82707645882002.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 13566978822244 + 6461875848484 = 3683338^2 + 2542022^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3164558.

It is a super-2 number, since 2×20028854670728² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

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 8 ways as a sum of consecutive naturals, for example, 772139183 + ... + 772165121.

Almost surely, 2^{20028854670728} is an apocalyptic number.

It is an amenable number.

20028854670728 is a deficient number, since it is larger than the sum of its proper divisors (18152453302717).

20028854670728 is an frugal number, since it uses more digits than its factorization.

20028854670728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52006 (or 26002 counting only the distinct ones).

The product of its (nonzero) digits is 24084480, while the sum is 59.

The spelling of 20028854670728 in words is "twenty trillion, twenty-eight billion, eight hundred fifty-four million, six hundred seventy thousand, seven hundred twenty-eight".