820320146 has 4 divisors (see below), whose sum is σ = 1230480222. Its totient is φ = 410160072.

The previous prime is 820320097. The next prime is 820320161. The reversal of 820320146 is 641023028.

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

It can be written as a sum of positive squares in only one way, i.e., 766459225 + 53860921 = 27685^2 + 7339^2 .

It is a super-2 number, since 2×820320146² = 1345850283866922632, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205080035 + ... + 205080038.

Almost surely, 2^820320146 is an apocalyptic number.

820320146 is a deficient number, since it is larger than the sum of its proper divisors (410160076).

820320146 is a wasteful number, since it uses less digits than its factorization.

820320146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410160075.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 820320146 is about 28641.2315726821. The cubic root of 820320146 is about 936.1119568336. Note that the first 3 decimals are identical.

The spelling of 820320146 in words is "eight hundred twenty million, three hundred twenty thousand, one hundred forty-six".