20209278418573 has 2 divisors, whose sum is σ = 20209278418574. Its totient is φ = 20209278418572.

The previous prime is 20209278418559. The next prime is 20209278418579. The reversal of 20209278418573 is 37581487290202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13143793440969 + 7065484977604 = 3625437^2 + 2658098^2 .

It is a cyclic number.

It is not a de Polignac number, because 20209278418573 - 2²⁹ = 20208741547661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20209278418579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10104639209286 + 10104639209287.

It is an arithmetic number, because the mean of its divisors is an integer number (10104639209287).

Almost surely, 2^{20209278418573} is an apocalyptic number.

It is an amenable number.

20209278418573 is a deficient number, since it is larger than the sum of its proper divisors (1).

20209278418573 is an equidigital number, since it uses as much as digits as its factorization.

20209278418573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13547520, while the sum is 58.

The spelling of 20209278418573 in words is "twenty trillion, two hundred nine billion, two hundred seventy-eight million, four hundred eighteen thousand, five hundred seventy-three".