20828660843 has 4 divisors (see below), whose sum is σ = 21079608648. Its totient is φ = 20577713040.

The previous prime is 20828660837. The next prime is 20828660849. The reversal of 20828660843 is 34806682802.

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 (20828660837) and next prime (20828660849).

It is a cyclic number.

It is not a de Polignac number, because 20828660843 - 2²⁴ = 20811883627 is a prime.

It is a super-2 number, since 2×20828660843² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20828660849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125473778 + ... + 125473943.

It is an arithmetic number, because the mean of its divisors is an integer number (5269902162).

Almost surely, 2^20828660843 is an apocalyptic number.

20828660843 is a deficient number, since it is larger than the sum of its proper divisors (250947805).

20828660843 is an equidigital number, since it uses as much as digits as its factorization.

20828660843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250947804.

The product of its (nonzero) digits is 884736, while the sum is 47.

The spelling of 20828660843 in words is "twenty billion, eight hundred twenty-eight million, six hundred sixty thousand, eight hundred forty-three".