20485570784771 has 2 divisors, whose sum is σ = 20485570784772. Its totient is φ = 20485570784770.

The previous prime is 20485570784753. The next prime is 20485570784801. The reversal of 20485570784771 is 17748707558402.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20485570784771 is a prime.

It is a super-2 number, since 2×20485570784771² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20485570784698 and 20485570784707.

It is not a weakly prime, because it can be changed into another prime (20485570784971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10242785392385 + 10242785392386.

It is an arithmetic number, because the mean of its divisors is an integer number (10242785392386).

Almost surely, 2^{20485570784771} is an apocalyptic number.

20485570784771 is a deficient number, since it is larger than the sum of its proper divisors (1).

20485570784771 is an equidigital number, since it uses as much as digits as its factorization.

20485570784771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122931200, while the sum is 65.

The spelling of 20485570784771 in words is "twenty trillion, four hundred eighty-five billion, five hundred seventy million, seven hundred eighty-four thousand, seven hundred seventy-one".