820381930 has 8 divisors (see below), whose sum is σ = 1476687492. Its totient is φ = 328152768.

The previous prime is 820381901. The next prime is 820381967. The reversal of 820381930 is 39183028.

It can be written as a sum of positive squares in 2 ways, for example, as 815502249 + 4879681 = 28557^2 + 2209^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×820381930² = 1346053022141049800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41019087 + ... + 41019106.

Almost surely, 2^820381930 is an apocalyptic number.

820381930 is a deficient number, since it is larger than the sum of its proper divisors (656305562).

820381930 is a wasteful number, since it uses less digits than its factorization.

820381930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82038200.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 820381930 is about 28642.3101372777. The cubic root of 820381930 is about 936.1354579384.

The spelling of 820381930 in words is "eight hundred twenty million, three hundred eighty-one thousand, nine hundred thirty".