820909982 has 8 divisors (see below), whose sum is σ = 1239208536. Its totient is φ = 407840472.

The previous prime is 820909981. The next prime is 820910071. The reversal of 820909982 is 289909028.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820909981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1306868 + ... + 1307495.

It is an arithmetic number, because the mean of its divisors is an integer number (154901067).

Almost surely, 2^820909982 is an apocalyptic number.

820909982 is a deficient number, since it is larger than the sum of its proper divisors (418298554).

820909982 is a wasteful number, since it uses less digits than its factorization.

820909982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2614522.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 820909982 is about 28651.5266957976. The cubic root of 820909982 is about 936.3362677319.

The spelling of 820909982 in words is "eight hundred twenty million, nine hundred nine thousand, nine hundred eighty-two".