820309190 has 16 divisors (see below), whose sum is σ = 1480282992. Its totient is φ = 327295584.

The previous prime is 820309183. The next prime is 820309223. The reversal of 820309190 is 91903028.

820309190 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×820309190² = 1345814334396912200, which contains 22 as substring.

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, 99344 + ... + 107283.

It is an arithmetic number, because the mean of its divisors is an integer number (92517687).

Almost surely, 2^820309190 is an apocalyptic number.

820309190 is a deficient number, since it is larger than the sum of its proper divisors (659973802).

820309190 is a wasteful number, since it uses less digits than its factorization.

820309190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207031.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 820309190 is about 28641.0403093184. The cubic root of 820309190 is about 936.1077893191.

The spelling of 820309190 in words is "eight hundred twenty million, three hundred nine thousand, one hundred ninety".