20874972292817 has 2 divisors, whose sum is σ = 20874972292818. Its totient is φ = 20874972292816.

The previous prime is 20874972292789. The next prime is 20874972292849. The reversal of 20874972292817 is 71829227947802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18938154536401 + 1936817756416 = 4351799^2 + 1391696^2 .

It is a cyclic number.

It is not a de Polignac number, because 20874972292817 - 2¹⁰ = 20874972291793 is a prime.

It is not a weakly prime, because it can be changed into another prime (20874972292717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10437486146408 + 10437486146409.

It is an arithmetic number, because the mean of its divisors is an integer number (10437486146409).

Almost surely, 2^{20874972292817} is an apocalyptic number.

It is an amenable number.

20874972292817 is a deficient number, since it is larger than the sum of its proper divisors (1).

20874972292817 is an equidigital number, since it uses as much as digits as its factorization.

20874972292817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 113799168, while the sum is 68.

The spelling of 20874972292817 in words is "twenty trillion, eight hundred seventy-four billion, nine hundred seventy-two million, two hundred ninety-two thousand, eight hundred seventeen".