20828664662786 has 32 divisors (see below), whose sum is σ = 32124693270000. Its totient is φ = 10121091305472.

The previous prime is 20828664662777. The next prime is 20828664662791. The reversal of 20828664662786 is 68726646682802.

It can be written as a sum of positive squares in 8 ways, for example, as 15240286862161 + 5588377800625 = 3903881^2 + 2363975^2 .

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, 509873690 + ... + 509914538.

Almost surely, 2^{20828664662786} is an apocalyptic number.

20828664662786 is a deficient number, since it is larger than the sum of its proper divisors (11296028607214).

20828664662786 is a wasteful number, since it uses less digits than its factorization.

20828664662786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48726.

The product of its (nonzero) digits is 891813888, while the sum is 71.

The spelling of 20828664662786 in words is "twenty trillion, eight hundred twenty-eight billion, six hundred sixty-four million, six hundred sixty-two thousand, seven hundred eighty-six".