20856473371 has 4 divisors (see below), whose sum is σ = 20856868200. Its totient is φ = 20856078544.

The previous prime is 20856473359. The next prime is 20856473383. The reversal of 20856473371 is 17337465802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20856473359) and next prime (20856473383).

It is a cyclic number.

It is not a de Polignac number, because 20856473371 - 2⁹ = 20856472859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20856473321) 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 in 3 ways as a sum of consecutive naturals, for example, 103186 + ... + 228823.

It is an arithmetic number, because the mean of its divisors is an integer number (5214217050).

Almost surely, 2^20856473371 is an apocalyptic number.

20856473371 is a deficient number, since it is larger than the sum of its proper divisors (394829).

20856473371 is an equidigital number, since it uses as much as digits as its factorization.

20856473371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394828.

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 20856473371 in words is "twenty billion, eight hundred fifty-six million, four hundred seventy-three thousand, three hundred seventy-one".