21374440

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^2\times {\mathrm{43}}^2$

素因数の和:131

約数の個数: 72

約数和(自身を含む): 52303590

約数和(自身を除く): 30929150

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 43, 68, 85, 86, 136, 170, 172, 215, 289, 340, 344, 430, 578, 680, 731, 860, 1156, 1445, 1462, 1720, 1849, 2312, 2890, 2924, 3655, 3698, 5780, 5848, 7310, 7396, 9245, 11560, 12427, 14620, 14792, 18490, 24854, 29240, 31433, 36980, 49708, 62135, 62866, 73960, 99416, 124270, 125732, 157165, 248540, 251464, 314330, 497080, 534361, 628660, 1068722, 1257320, 2137444, 2671805, 4274888, 5343610, 10687220, 21374440]

約数ペア:

[(1, 21374440), (2, 10687220), (4, 5343610), (5, 4274888), (8, 2671805), (10, 2137444), (17, 1257320), (20, 1068722), (34, 628660), (40, 534361), (43, 497080), (68, 314330), (85, 251464), (86, 248540), (136, 157165), (170, 125732), (172, 124270), (215, 99416), (289, 73960), (340, 62866), (344, 62135), (430, 49708), (578, 36980), (680, 31433), (731, 29240), (860, 24854), (1156, 18490), (1445, 14792), (1462, 14620), (1720, 12427), (1849, 11560), (2312, 9245), (2890, 7396), (2924, 7310), (3655, 5848), (3698, 5780)]