20000747777 has 2 divisors, whose sum is σ = 20000747778. Its totient is φ = 20000747776.

The previous prime is 20000747749. The next prime is 20000747779. The reversal of 20000747777 is 77774700002.

It is a Cunningham number, because it is equal to 141424²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20000747776 + 1 = 141424^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000747777 - 2¹⁶ = 20000682241 is a prime.

Together with 20000747779, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20000747779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000373888 + 10000373889.

It is an arithmetic number, because the mean of its divisors is an integer number (10000373889).

Almost surely, 2^20000747777 is an apocalyptic number.

It is an amenable number.

20000747777 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000747777 is an equidigital number, since it uses as much as digits as its factorization.

20000747777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 134456, while the sum is 41.

The spelling of 20000747777 in words is "twenty billion, seven hundred forty-seven thousand, seven hundred seventy-seven".