820195772 has 12 divisors (see below), whose sum is σ = 1565828376. Its totient is φ = 372816240.

The previous prime is 820195741. The next prime is 820195793. The reversal of 820195772 is 277591028.

820195772 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 2×820195772² = 1345442208813351968, 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 3 ways as a sum of consecutive naturals, for example, 9320363 + ... + 9320450.

It is an arithmetic number, because the mean of its divisors is an integer number (130485698).

Almost surely, 2^820195772 is an apocalyptic number.

It is an amenable number.

820195772 is a deficient number, since it is larger than the sum of its proper divisors (745632604).

820195772 is a wasteful number, since it uses less digits than its factorization.

820195772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18640828 (or 18640826 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 820195772 is about 28639.0602499454. The cubic root of 820195772 is about 936.0646444626.

The spelling of 820195772 in words is "eight hundred twenty million, one hundred ninety-five thousand, seven hundred seventy-two".