20545540289 has 2 divisors, whose sum is σ = 20545540290. Its totient is φ = 20545540288.

The previous prime is 20545540283. The next prime is 20545540321. The reversal of 20545540289 is 98204554502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14770756225 + 5774784064 = 121535^2 + 75992^2 .

It is a cyclic number.

It is not a de Polignac number, because 20545540289 - 2⁴ = 20545540273 is a prime.

It is not a weakly prime, because it can be changed into another prime (20545540283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10272770144 + 10272770145.

It is an arithmetic number, because the mean of its divisors is an integer number (10272770145).

Almost surely, 2^20545540289 is an apocalyptic number.

It is an amenable number.

20545540289 is a deficient number, since it is larger than the sum of its proper divisors (1).

20545540289 is an equidigital number, since it uses as much as digits as its factorization.

20545540289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576000, while the sum is 44.

The spelling of 20545540289 in words is "twenty billion, five hundred forty-five million, five hundred forty thousand, two hundred eighty-nine".