820143380 has 36 divisors (see below), whose sum is σ = 2003495508. Its totient is φ = 281191680.

The previous prime is 820143301. The next prime is 820143383. The reversal of 820143380 is 83341028.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 342546064 + 477597316 = 18508^2 + 21854^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820143383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 417461 + ... + 419420.

It is an arithmetic number, because the mean of its divisors is an integer number (55652653).

Almost surely, 2^820143380 is an apocalyptic number.

It is an amenable number.

820143380 is an abundant number, since it is smaller than the sum of its proper divisors (1183352128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820143380 is a wasteful number, since it uses less digits than its factorization.

820143380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836904 (or 836895 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 820143380 is about 28638.1455405199. The cubic root of 820143380 is about 936.0447129029.

The spelling of 820143380 in words is "eight hundred twenty million, one hundred forty-three thousand, three hundred eighty".