20386660795281 has 81 divisors (see below), whose sum is σ = 32921798087451. Its totient is φ = 12147583773600.

The previous prime is 20386660795229. The next prime is 20386660795309. The reversal of 20386660795281 is 18259706668302.

It is a happy number.

The square root of 20386660795281 is 4515159.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 662936295681 + 19723724499600 = 814209^2 + 4441140^2 .

It is not a de Polignac number, because 20386660795281 - 2⁹ = 20386660794769 is a prime.

It is a super-2 number, since 2×20386660795281² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20386660395281) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 9089013946 + ... + 9089016188.

Almost surely, 2^{20386660795281} is an apocalyptic number.

20386660795281 is the 4515159-th square number.

20386660795281 is the 2257580-th centered octagonal number.

It is an amenable number.

20386660795281 is a deficient number, since it is larger than the sum of its proper divisors (12535137292170).

20386660795281 is an frugal number, since it uses more digits than its factorization.

20386660795281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4636 (or 2318 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 63.

The spelling of 20386660795281 in words is "twenty trillion, three hundred eighty-six billion, six hundred sixty million, seven hundred ninety-five thousand, two hundred eighty-one".