820139630 has 16 divisors (see below), whose sum is σ = 1498286160. Its totient is φ = 323159232.

The previous prime is 820139623. The next prime is 820139641. The reversal of 820139630 is 36931028.

820139630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611375 + ... + 612714.

It is an arithmetic number, because the mean of its divisors is an integer number (93642885).

Almost surely, 2^820139630 is an apocalyptic number.

820139630 is a deficient number, since it is larger than the sum of its proper divisors (678146530).

820139630 is a wasteful number, since it uses less digits than its factorization.

820139630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224163.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 820139630 is about 28638.0800683286. The cubic root of 820139630 is about 936.0432862527.

The spelling of 820139630 in words is "eight hundred twenty million, one hundred thirty-nine thousand, six hundred thirty".