820947195 has 24 divisors (see below), whose sum is σ = 1429735632. Its totient is φ = 435758400.

The previous prime is 820947173. The next prime is 820947217. The reversal of 820947195 is 591749028.

It is an interprime number because it is at equal distance from previous prime (820947173) and next prime (820947217).

It is not a de Polignac number, because 820947195 - 2⁶ = 820947131 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 820947195.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33736 + ... + 52725.

It is an arithmetic number, because the mean of its divisors is an integer number (59572318).

Almost surely, 2^820947195 is an apocalyptic number.

820947195 is a deficient number, since it is larger than the sum of its proper divisors (608788437).

820947195 is a wasteful number, since it uses less digits than its factorization.

820947195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86683 (or 86680 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 820947195 is about 28652.1760953684. The cubic root of 820947195 is about 936.3504159966.

The spelling of 820947195 in words is "eight hundred twenty million, nine hundred forty-seven thousand, one hundred ninety-five".