20805067447 has 2 divisors, whose sum is σ = 20805067448. Its totient is φ = 20805067446.

The previous prime is 20805067441. The next prime is 20805067457. The reversal of 20805067447 is 74476050802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20805067447 - 2⁷ = 20805067319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20805067441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10402533723 + 10402533724.

It is an arithmetic number, because the mean of its divisors is an integer number (10402533724).

Almost surely, 2^20805067447 is an apocalyptic number.

20805067447 is a deficient number, since it is larger than the sum of its proper divisors (1).

20805067447 is an equidigital number, since it uses as much as digits as its factorization.

20805067447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 376320, while the sum is 43.

The spelling of 20805067447 in words is "twenty billion, eight hundred five million, sixty-seven thousand, four hundred forty-seven".