82020644564 has 24 divisors (see below), whose sum is σ = 149831136000. Its totient is φ = 39241477440.

The previous prime is 82020644539. The next prime is 82020644567. The reversal of 82020644564 is 46544602028.

It is a super-2 number, since 2×82020644564² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82020644567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3705014 + ... + 3727085.

It is an arithmetic number, because the mean of its divisors is an integer number (6242964000).

Almost surely, 2^82020644564 is an apocalyptic number.

It is an amenable number.

82020644564 is a deficient number, since it is larger than the sum of its proper divisors (67810491436).

82020644564 is a wasteful number, since it uses less digits than its factorization.

82020644564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7432223 (or 7432221 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 41.

The spelling of 82020644564 in words is "eighty-two billion, twenty million, six hundred forty-four thousand, five hundred sixty-four".