20843244377 has 2 divisors, whose sum is σ = 20843244378. Its totient is φ = 20843244376.

The previous prime is 20843244371. The next prime is 20843244419. The reversal of 20843244377 is 77344234802.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11240028361 + 9603216016 = 106019^2 + 97996^2 .

It is a cyclic number.

It is not a de Polignac number, because 20843244377 - 2²² = 20839050073 is a prime.

It is not a weakly prime, because it can be changed into another prime (20843244371) 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, 10421622188 + 10421622189.

It is an arithmetic number, because the mean of its divisors is an integer number (10421622189).

Almost surely, 2^20843244377 is an apocalyptic number.

It is an amenable number.

20843244377 is a deficient number, since it is larger than the sum of its proper divisors (1).

20843244377 is an equidigital number, since it uses as much as digits as its factorization.

20843244377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 903168, while the sum is 44.

The spelling of 20843244377 in words is "twenty billion, eight hundred forty-three million, two hundred forty-four thousand, three hundred seventy-seven".