20756757667 has 2 divisors, whose sum is σ = 20756757668. Its totient is φ = 20756757666.

The previous prime is 20756757653. The next prime is 20756757683. The reversal of 20756757667 is 76675765702.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20756757667 - 2¹⁵ = 20756724899 is a prime.

It is not a weakly prime, because it can be changed into another prime (20756757367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10378378833 + 10378378834.

It is an arithmetic number, because the mean of its divisors is an integer number (10378378834).

Almost surely, 2^20756757667 is an apocalyptic number.

20756757667 is a deficient number, since it is larger than the sum of its proper divisors (1).

20756757667 is an equidigital number, since it uses as much as digits as its factorization.

20756757667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25930800, while the sum is 58.

The spelling of 20756757667 in words is "twenty billion, seven hundred fifty-six million, seven hundred fifty-seven thousand, six hundred sixty-seven".