820193143 has 16 divisors (see below), whose sum is σ = 1025558784. Its totient is φ = 637248960.

The previous prime is 820193123. The next prime is 820193177. The reversal of 820193143 is 341391028.

It is a cyclic number.

It is not a de Polignac number, because 820193143 - 2²¹ = 818095991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820193113) 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 15 ways as a sum of consecutive naturals, for example, 11371 + ... + 42067.

It is an arithmetic number, because the mean of its divisors is an integer number (64097424).

Almost surely, 2^820193143 is an apocalyptic number.

820193143 is a deficient number, since it is larger than the sum of its proper divisors (205365641).

820193143 is a wasteful number, since it uses less digits than its factorization.

820193143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31062.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 820193143 is about 28639.0143510561. The cubic root of 820193143 is about 936.0636443288.

The spelling of 820193143 in words is "eight hundred twenty million, one hundred ninety-three thousand, one hundred forty-three".