82521020 has 12 divisors (see below), whose sum is σ = 173294184. Its totient is φ = 33008400.

The previous prime is 82521013. The next prime is 82521029. The reversal of 82521020 is 2012528.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 4126051 = 82521020 / (8 + 2 + 5 + 2 + 1 + 0 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 82520983 and 82521001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82521029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2063006 + ... + 2063045.

It is an arithmetic number, because the mean of its divisors is an integer number (14441182).

Almost surely, 2^82521020 is an apocalyptic number.

It is an amenable number.

82521020 is an abundant number, since it is smaller than the sum of its proper divisors (90773164).

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

82521020 is a wasteful number, since it uses less digits than its factorization.

82521020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126060 (or 4126058 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 82521020 is about 9084.1081015144. The cubic root of 82521020 is about 435.3663536359.

Adding to 82521020 its reverse (2012528), we get a palindrome (84533548).

The spelling of 82521020 in words is "eighty-two million, five hundred twenty-one thousand, twenty".