81999980

素因数分解:

$2^2\times 5^1\times {\mathrm{137}}^1\times {\mathrm{29927}}^1$

素因数の和:30073

約数の個数: 24

約数和(自身を含む): 173462688

約数和(自身を除く): 91462708

約数列:

[1, 2, 4, 5, 10, 20, 137, 274, 548, 685, 1370, 2740, 29927, 59854, 119708, 149635, 299270, 598540, 4099999, 8199998, 16399996, 20499995, 40999990, 81999980]

約数ペア:

[(1, 81999980), (2, 40999990), (4, 20499995), (5, 16399996), (10, 8199998), (20, 4099999), (137, 598540), (274, 299270), (548, 149635), (685, 119708), (1370, 59854), (2740, 29927)]