81236620

素因数分解:

$2^2\times 5^1\times {\mathrm{643}}^1\times {\mathrm{6317}}^1$

素因数の和:6969

約数の個数: 24

約数和(自身を含む): 170889264

約数和(自身を除く): 89652644

約数列:

[1, 2, 4, 5, 10, 20, 643, 1286, 2572, 3215, 6317, 6430, 12634, 12860, 25268, 31585, 63170, 126340, 4061831, 8123662, 16247324, 20309155, 40618310, 81236620]

約数ペア:

[(1, 81236620), (2, 40618310), (4, 20309155), (5, 16247324), (10, 8123662), (20, 4061831), (643, 126340), (1286, 63170), (2572, 31585), (3215, 25268), (6317, 12860), (6430, 12634)]