820143723 has 24 divisors (see below), whose sum is σ = 1273152000. Its totient is φ = 468251280.

The previous prime is 820143713. The next prime is 820143743. The reversal of 820143723 is 327341028.

820143723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 820143723 - 2⁶ = 820143659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (820143713) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 292458 + ... + 295248.

It is an arithmetic number, because the mean of its divisors is an integer number (53048000).

Almost surely, 2^820143723 is an apocalyptic number.

820143723 is a deficient number, since it is larger than the sum of its proper divisors (453008277).

820143723 is a wasteful number, since it uses less digits than its factorization.

820143723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4807 (or 4800 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 820143723 is about 28638.1515290355. The cubic root of 820143723 is about 936.0448433936.

The spelling of 820143723 in words is "eight hundred twenty million, one hundred forty-three thousand, seven hundred twenty-three".