20806455827 has 2 divisors, whose sum is σ = 20806455828. Its totient is φ = 20806455826.

The previous prime is 20806455821. The next prime is 20806455869. The reversal of 20806455827 is 72855460802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20806455827 - 2⁶ = 20806455763 is a prime.

It is not a weakly prime, because it can be changed into another prime (20806455821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10403227913 + 10403227914.

It is an arithmetic number, because the mean of its divisors is an integer number (10403227914).

Almost surely, 2^20806455827 is an apocalyptic number.

20806455827 is a deficient number, since it is larger than the sum of its proper divisors (1).

20806455827 is an equidigital number, since it uses as much as digits as its factorization.

20806455827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1075200, while the sum is 47.

The spelling of 20806455827 in words is "twenty billion, eight hundred six million, four hundred fifty-five thousand, eight hundred twenty-seven".