20260278361 has 2 divisors, whose sum is σ = 20260278362. Its totient is φ = 20260278360.

The previous prime is 20260278349. The next prime is 20260278407. The reversal of 20260278361 is 16387206202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20179907136 + 80371225 = 142056^2 + 8965^2 .

It is a cyclic number.

It is not a de Polignac number, because 20260278361 - 2¹³ = 20260270169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20260278361.

It is not a weakly prime, because it can be changed into another prime (20260278331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10130139180 + 10130139181.

It is an arithmetic number, because the mean of its divisors is an integer number (10130139181).

Almost surely, 2^20260278361 is an apocalyptic number.

It is an amenable number.

20260278361 is a deficient number, since it is larger than the sum of its proper divisors (1).

20260278361 is an equidigital number, since it uses as much as digits as its factorization.

20260278361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The spelling of 20260278361 in words is "twenty billion, two hundred sixty million, two hundred seventy-eight thousand, three hundred sixty-one".