20856133819 has 2 divisors, whose sum is σ = 20856133820. Its totient is φ = 20856133818.

The previous prime is 20856133811. The next prime is 20856133847. The reversal of 20856133819 is 91833165802.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20856133819 - 2³ = 20856133811 is a prime.

It is a super-2 number, since 2×20856133819² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20856133811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10428066909 + 10428066910.

It is an arithmetic number, because the mean of its divisors is an integer number (10428066910).

Almost surely, 2^20856133819 is an apocalyptic number.

20856133819 is a deficient number, since it is larger than the sum of its proper divisors (1).

20856133819 is an equidigital number, since it uses as much as digits as its factorization.

20856133819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 20856133819 in words is "twenty billion, eight hundred fifty-six million, one hundred thirty-three thousand, eight hundred nineteen".