820245120 has 128 divisors (see below), whose sum is σ = 2699066880. Its totient is φ = 211660800.

The previous prime is 820245109. The next prime is 820245163. The reversal of 820245120 is 21542028.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52630 + ... + 66410.

It is an arithmetic number, because the mean of its divisors is an integer number (21086460).

Almost surely, 2^820245120 is an apocalyptic number.

820245120 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 820245120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1349533440).

820245120 is an abundant number, since it is smaller than the sum of its proper divisors (1878821760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

820245120 is a wasteful number, since it uses less digits than its factorization.

820245120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13834 (or 13822 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 820245120 is about 28639.9217876027. The cubic root of 820245120 is about 936.0834172131.

Adding to 820245120 its reverse (21542028), we get a palindrome (841787148).

The spelling of 820245120 in words is "eight hundred twenty million, two hundred forty-five thousand, one hundred twenty".