20805220267 has 16 divisors (see below), whose sum is σ = 24086684160. Its totient is φ = 17806921632.

The previous prime is 20805220207. The next prime is 20805220273. The reversal of 20805220267 is 76202250802.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20805220267 - 2¹¹ = 20805218219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20805220207) 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 in 15 ways as a sum of consecutive naturals, for example, 884473 + ... + 907690.

It is an arithmetic number, because the mean of its divisors is an integer number (1505417760).

Almost surely, 2^20805220267 is an apocalyptic number.

20805220267 is a deficient number, since it is larger than the sum of its proper divisors (3281463893).

20805220267 is a wasteful number, since it uses less digits than its factorization.

20805220267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792242.

The product of its (nonzero) digits is 26880, while the sum is 34.

The spelling of 20805220267 in words is "twenty billion, eight hundred five million, two hundred twenty thousand, two hundred sixty-seven".