80204020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^2\times {\mathrm{61}}^1\times {\mathrm{389}}^1$

素因数の和:485

約数の個数: 72

約数和(自身を含む): 185847480

約数和(自身を除く): 105643460

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 61, 65, 122, 130, 169, 244, 260, 305, 338, 389, 610, 676, 778, 793, 845, 1220, 1556, 1586, 1690, 1945, 3172, 3380, 3890, 3965, 5057, 7780, 7930, 10114, 10309, 15860, 20228, 20618, 23729, 25285, 41236, 47458, 50570, 51545, 65741, 94916, 101140, 103090, 118645, 131482, 206180, 237290, 262964, 308477, 328705, 474580, 616954, 657410, 1233908, 1314820, 1542385, 3084770, 4010201, 6169540, 8020402, 16040804, 20051005, 40102010, 80204020]

約数ペア:

[(1, 80204020), (2, 40102010), (4, 20051005), (5, 16040804), (10, 8020402), (13, 6169540), (20, 4010201), (26, 3084770), (52, 1542385), (61, 1314820), (65, 1233908), (122, 657410), (130, 616954), (169, 474580), (244, 328705), (260, 308477), (305, 262964), (338, 237290), (389, 206180), (610, 131482), (676, 118645), (778, 103090), (793, 101140), (845, 94916), (1220, 65741), (1556, 51545), (1586, 50570), (1690, 47458), (1945, 41236), (3172, 25285), (3380, 23729), (3890, 20618), (3965, 20228), (5057, 15860), (7780, 10309), (7930, 10114)]