20773412281 has 4 divisors (see below), whose sum is σ = 20773758964. Its totient is φ = 20773065600.

The previous prime is 20773412267. The next prime is 20773412287. The reversal of 20773412281 is 18221437702.

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 16662679056 + 4110733225 = 129084^2 + 64115^2 .

It is a cyclic number.

It is not a de Polignac number, because 20773412281 - 2²¹ = 20771315129 is a prime.

It is a super-2 number, since 2×20773412281² (a number of 21 digits) contains 22 as substring.

It is a deceptive number, since it divides R_20773412280.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20773412281.

It is not an unprimeable number, because it can be changed into a prime (20773412287) 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, 57780 + ... + 211861.

It is an arithmetic number, because the mean of its divisors is an integer number (5193439741).

Almost surely, 2^20773412281 is an apocalyptic number.

20773412281 is the 77041-st nonagonal number.

It is an amenable number.

20773412281 is a deficient number, since it is larger than the sum of its proper divisors (346683).

20773412281 is an equidigital number, since it uses as much as digits as its factorization.

20773412281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346682.

The product of its (nonzero) digits is 37632, while the sum is 37.

Adding to 20773412281 its reverse (18221437702), we get a palindrome (38994849983).

The spelling of 20773412281 in words is "twenty billion, seven hundred seventy-three million, four hundred twelve thousand, two hundred eighty-one".