20958774673 has 2 divisors, whose sum is σ = 20958774674. Its totient is φ = 20958774672.

The previous prime is 20958774659. The next prime is 20958774761. The reversal of 20958774673 is 37647785902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13888151104 + 7070623569 = 117848^2 + 84087^2 .

It is a cyclic number.

It is not a de Polignac number, because 20958774673 - 2¹³ = 20958766481 is a prime.

It is not a weakly prime, because it can be changed into another prime (20955774673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10479387336 + 10479387337.

It is an arithmetic number, because the mean of its divisors is an integer number (10479387337).

Almost surely, 2^20958774673 is an apocalyptic number.

It is an amenable number.

20958774673 is a deficient number, since it is larger than the sum of its proper divisors (1).

20958774673 is an equidigital number, since it uses as much as digits as its factorization.

20958774673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17781120, while the sum is 58.

The spelling of 20958774673 in words is "twenty billion, nine hundred fifty-eight million, seven hundred seventy-four thousand, six hundred seventy-three".