20854648169647 has 2 divisors, whose sum is σ = 20854648169648. Its totient is φ = 20854648169646.

The previous prime is 20854648169569. The next prime is 20854648169671. The reversal of 20854648169647 is 74696184645802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20854648169647 - 2⁷ = 20854648169519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20854648469647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10427324084823 + 10427324084824.

It is an arithmetic number, because the mean of its divisors is an integer number (10427324084824).

Almost surely, 2^{20854648169647} is an apocalyptic number.

20854648169647 is a deficient number, since it is larger than the sum of its proper divisors (1).

20854648169647 is an equidigital number, since it uses as much as digits as its factorization.

20854648169647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 557383680, while the sum is 70.

The spelling of 20854648169647 in words is "twenty trillion, eight hundred fifty-four billion, six hundred forty-eight million, one hundred sixty-nine thousand, six hundred forty-seven".