20678244281 has 4 divisors (see below), whose sum is σ = 20678645364. Its totient is φ = 20677843200.

The previous prime is 20678244241. The next prime is 20678244299. The reversal of 20678244281 is 18244287602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17235488656 + 3442755625 = 131284^2 + 58675^2 .

It is a cyclic number.

It is not a de Polignac number, because 20678244281 - 2¹⁸ = 20677982137 is a prime.

It is a super-2 number, since 2×20678244281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20678244211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109400 + ... + 230921.

It is an arithmetic number, because the mean of its divisors is an integer number (5169661341).

Almost surely, 2^20678244281 is an apocalyptic number.

It is an amenable number.

20678244281 is a deficient number, since it is larger than the sum of its proper divisors (401083).

20678244281 is an equidigital number, since it uses as much as digits as its factorization.

20678244281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401082.

The product of its (nonzero) digits is 344064, while the sum is 44.

The spelling of 20678244281 in words is "twenty billion, six hundred seventy-eight million, two hundred forty-four thousand, two hundred eighty-one".