20794605851 has 2 divisors, whose sum is σ = 20794605852. Its totient is φ = 20794605850.

The previous prime is 20794605833. The next prime is 20794605929. The reversal of 20794605851 is 15850649702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20794605851 - 2³⁴ = 3614736667 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20794605796 and 20794605805.

It is not a weakly prime, because it can be changed into another prime (20794608851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10397302925 + 10397302926.

It is an arithmetic number, because the mean of its divisors is an integer number (10397302926).

Almost surely, 2^20794605851 is an apocalyptic number.

20794605851 is a deficient number, since it is larger than the sum of its proper divisors (1).

20794605851 is an equidigital number, since it uses as much as digits as its factorization.

20794605851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 47.

The spelling of 20794605851 in words is "twenty billion, seven hundred ninety-four million, six hundred five thousand, eight hundred fifty-one".