21204860

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{109}}^1\times {\mathrm{137}}^1$

素因数の和:326

約数の個数: 48

約数和(自身を含む): 45904320

約数和(自身を除く): 24699460

約数列:

[1, 2, 4, 5, 10, 20, 71, 109, 137, 142, 218, 274, 284, 355, 436, 545, 548, 685, 710, 1090, 1370, 1420, 2180, 2740, 7739, 9727, 14933, 15478, 19454, 29866, 30956, 38695, 38908, 48635, 59732, 74665, 77390, 97270, 149330, 154780, 194540, 298660, 1060243, 2120486, 4240972, 5301215, 10602430, 21204860]

約数ペア:

[(1, 21204860), (2, 10602430), (4, 5301215), (5, 4240972), (10, 2120486), (20, 1060243), (71, 298660), (109, 194540), (137, 154780), (142, 149330), (218, 97270), (274, 77390), (284, 74665), (355, 59732), (436, 48635), (545, 38908), (548, 38695), (685, 30956), (710, 29866), (1090, 19454), (1370, 15478), (1420, 14933), (2180, 9727), (2740, 7739)]