20218346873 has 2 divisors, whose sum is σ = 20218346874. Its totient is φ = 20218346872.

The previous prime is 20218346843. The next prime is 20218346923. The reversal of 20218346873 is 37864381202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17963236729 + 2255110144 = 134027^2 + 47488^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20218346873 is a prime.

It is not a weakly prime, because it can be changed into another prime (20218346833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10109173436 + 10109173437.

It is an arithmetic number, because the mean of its divisors is an integer number (10109173437).

Almost surely, 2^20218346873 is an apocalyptic number.

It is an amenable number.

20218346873 is a deficient number, since it is larger than the sum of its proper divisors (1).

20218346873 is an equidigital number, since it uses as much as digits as its factorization.

20218346873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 44.

The spelling of 20218346873 in words is "twenty billion, two hundred eighteen million, three hundred forty-six thousand, eight hundred seventy-three".