20784885359279 has 2 divisors, whose sum is σ = 20784885359280. Its totient is φ = 20784885359278.

The previous prime is 20784885359269. The next prime is 20784885359299. The reversal of 20784885359279 is 97295358848702.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20784885359279 is a prime.

It is a super-2 number, since 2×20784885359279² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20784885359269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10392442679639 + 10392442679640.

It is an arithmetic number, because the mean of its divisors is an integer number (10392442679640).

Almost surely, 2^{20784885359279} is an apocalyptic number.

20784885359279 is a deficient number, since it is larger than the sum of its proper divisors (1).

20784885359279 is an equidigital number, since it uses as much as digits as its factorization.

20784885359279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2438553600, while the sum is 77.

The spelling of 20784885359279 in words is "twenty trillion, seven hundred eighty-four billion, eight hundred eighty-five million, three hundred fifty-nine thousand, two hundred seventy-nine".