20891980

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{1429}}^1$

素因数の和:1498

約数の個数: 48

約数和(自身を含む): 47567520

約数和(自身を除く): 26675540

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 43, 68, 85, 86, 170, 172, 215, 340, 430, 731, 860, 1429, 1462, 2858, 2924, 3655, 5716, 7145, 7310, 14290, 14620, 24293, 28580, 48586, 61447, 97172, 121465, 122894, 242930, 245788, 307235, 485860, 614470, 1044599, 1228940, 2089198, 4178396, 5222995, 10445990, 20891980]

約数ペア:

[(1, 20891980), (2, 10445990), (4, 5222995), (5, 4178396), (10, 2089198), (17, 1228940), (20, 1044599), (34, 614470), (43, 485860), (68, 307235), (85, 245788), (86, 242930), (170, 122894), (172, 121465), (215, 97172), (340, 61447), (430, 48586), (731, 28580), (860, 24293), (1429, 14620), (1462, 14290), (2858, 7310), (2924, 7145), (3655, 5716)]