20756433667 has 2 divisors, whose sum is σ = 20756433668. Its totient is φ = 20756433666.

The previous prime is 20756433661. The next prime is 20756433707. The reversal of 20756433667 is 76633465702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20756433667 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20756433667.

It is not a weakly prime, because it can be changed into another prime (20756433661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10378216833 + 10378216834.

It is an arithmetic number, because the mean of its divisors is an integer number (10378216834).

Almost surely, 2^20756433667 is an apocalyptic number.

20756433667 is a deficient number, since it is larger than the sum of its proper divisors (1).

20756433667 is an equidigital number, since it uses as much as digits as its factorization.

20756433667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3810240, while the sum is 49.

The spelling of 20756433667 in words is "twenty billion, seven hundred fifty-six million, four hundred thirty-three thousand, six hundred sixty-seven".