820265424 has 80 divisors (see below), whose sum is σ = 2333422080. Its totient is φ = 246225280.

The previous prime is 820265417. The next prime is 820265429. The reversal of 820265424 is 424562028.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820265429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49237 + ... + 63755.

It is an arithmetic number, because the mean of its divisors is an integer number (29167776).

Almost surely, 2^820265424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 820265424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1166711040).

820265424 is an abundant number, since it is smaller than the sum of its proper divisors (1513156656).

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

820265424 is a wasteful number, since it uses less digits than its factorization.

820265424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14648 (or 14642 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 820265424 is about 28640.2762556509. The cubic root of 820265424 is about 936.0911409534.

The spelling of 820265424 in words is "eight hundred twenty million, two hundred sixty-five thousand, four hundred twenty-four".