20670222761 has 2 divisors, whose sum is σ = 20670222762. Its totient is φ = 20670222760.

The previous prime is 20670222743. The next prime is 20670222767. The reversal of 20670222761 is 16722207602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17991125161 + 2679097600 = 134131^2 + 51760^2 .

It is a cyclic number.

It is not a de Polignac number, because 20670222761 - 2³⁴ = 3490353577 is a prime.

It is not a weakly prime, because it can be changed into another prime (20670222767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10335111380 + 10335111381.

It is an arithmetic number, because the mean of its divisors is an integer number (10335111381).

Almost surely, 2^20670222761 is an apocalyptic number.

It is an amenable number.

20670222761 is a deficient number, since it is larger than the sum of its proper divisors (1).

20670222761 is an equidigital number, since it uses as much as digits as its factorization.

20670222761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 35.

The spelling of 20670222761 in words is "twenty billion, six hundred seventy million, two hundred twenty-two thousand, seven hundred sixty-one".