82019720 has 16 divisors (see below), whose sum is σ = 184544460. Its totient is φ = 32807872.

The previous prime is 82019711. The next prime is 82019723. The reversal of 82019720 is 2791028.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 66227044 + 15792676 = 8138^2 + 3974^2 .

It is not an unprimeable number, because it can be changed into a prime (82019723) 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 3 ways as a sum of consecutive naturals, for example, 1025207 + ... + 1025286.

Almost surely, 2^82019720 is an apocalyptic number.

It is an amenable number.

82019720 is an abundant number, since it is smaller than the sum of its proper divisors (102524740).

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

82019720 is a wasteful number, since it uses less digits than its factorization.

82019720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050504 (or 2050500 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 82019720 is about 9056.4739275283. The cubic root of 82019720 is about 434.4829722793.

The spelling of 82019720 in words is "eighty-two million, nineteen thousand, seven hundred twenty".