20354665523447 has 2 divisors, whose sum is σ = 20354665523448. Its totient is φ = 20354665523446.

The previous prime is 20354665523383. The next prime is 20354665523459. The reversal of 20354665523447 is 74432556645302.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20354665523447 - 2⁶ = 20354665523383 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20354665523392 and 20354665523401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20354665523497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10177332761723 + 10177332761724.

It is an arithmetic number, because the mean of its divisors is an integer number (10177332761724).

Almost surely, 2^{20354665523447} is an apocalyptic number.

20354665523447 is a deficient number, since it is larger than the sum of its proper divisors (1).

20354665523447 is an equidigital number, since it uses as much as digits as its factorization.

20354665523447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576000, while the sum is 56.

The spelling of 20354665523447 in words is "twenty trillion, three hundred fifty-four billion, six hundred sixty-five million, five hundred twenty-three thousand, four hundred forty-seven".