20686704478277 has 2 divisors, whose sum is σ = 20686704478278. Its totient is φ = 20686704478276.

The previous prime is 20686704478213. The next prime is 20686704478357. The reversal of 20686704478277 is 77287440768602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16243487363041 + 4443217115236 = 4030321^2 + 2107894^2 .

It is a cyclic number.

It is not a de Polignac number, because 20686704478277 - 2⁶ = 20686704478213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20686704478177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10343352239138 + 10343352239139.

It is an arithmetic number, because the mean of its divisors is an integer number (10343352239139).

Almost surely, 2^{20686704478277} is an apocalyptic number.

It is an amenable number.

20686704478277 is a deficient number, since it is larger than the sum of its proper divisors (1).

20686704478277 is an equidigital number, since it uses as much as digits as its factorization.

20686704478277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 354041856, while the sum is 68.

The spelling of 20686704478277 in words is "twenty trillion, six hundred eighty-six billion, seven hundred four million, four hundred seventy-eight thousand, two hundred seventy-seven".