20857980

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{11}}^2\times {\mathrm{13}}^2\times {\mathrm{17}}^1$

素因数の和:77

約数の個数: 216

約数和(自身を含む): 73601136

約数和(自身を除く): 52743156

約数列:

[1, 2, 3, 4, 5, 6, 10, 11, 12, 13, 15, 17, 20, 22, 26, 30, 33, 34, 39, 44, 51, 52, 55, 60, 65, 66, 68, 78, 85, 102, 110, 121, 130, 132, 143, 156, 165, 169, 170, 187, 195, 204, 220, 221, 242, 255, 260, 286, 330, 338, 340, 363, 374, 390, 429, 442, 484, 507, 510, 561, 572, 605, 660, 663, 676, 715, 726, 748, 780, 845, 858, 884, 935, 1014, 1020, 1105, 1122, 1210, 1326, 1430, 1452, 1573, 1690, 1716, 1815, 1859, 1870, 2028, 2057, 2145, 2210, 2244, 2420, 2431, 2535, 2652, 2805, 2860, 2873, 3146, 3315, 3380, 3630, 3718, 3740, 4114, 4290, 4420, 4719, 4862, 5070, 5577, 5610, 5746, 6171, 6292, 6630, 7260, 7293, 7436, 7865, 8228, 8580, 8619, 9295, 9438, 9724, 10140, 10285, 11154, 11220, 11492, 12155, 12342, 13260, 14365, 14586, 15730, 17238, 18590, 18876, 20449, 20570, 22308, 23595, 24310, 24684, 26741, 27885, 28730, 29172, 30855, 31460, 31603, 34476, 36465, 37180, 40898, 41140, 43095, 47190, 48620, 53482, 55770, 57460, 61347, 61710, 63206, 72930, 80223, 81796, 86190, 94380, 94809, 102245, 106964, 111540, 122694, 123420, 126412, 133705, 145860, 158015, 160446, 172380, 189618, 204490, 245388, 267410, 306735, 316030, 320892, 347633, 379236, 401115, 408980, 474045, 534820, 613470, 632060, 695266, 802230, 948090, 1042899, 1226940, 1390532, 1604460, 1738165, 1896180, 2085798, 3476330, 4171596, 5214495, 6952660, 10428990, 20857980]

約数ペア:

[(1, 20857980), (2, 10428990), (3, 6952660), (4, 5214495), (5, 4171596), (6, 3476330), (10, 2085798), (11, 1896180), (12, 1738165), (13, 1604460), (15, 1390532), (17, 1226940), (20, 1042899), (22, 948090), (26, 802230), (30, 695266), (33, 632060), (34, 613470), (39, 534820), (44, 474045), (51, 408980), (52, 401115), (55, 379236), (60, 347633), (65, 320892), (66, 316030), (68, 306735), (78, 267410), (85, 245388), (102, 204490), (110, 189618), (121, 172380), (130, 160446), (132, 158015), (143, 145860), (156, 133705), (165, 126412), (169, 123420), (170, 122694), (187, 111540), (195, 106964), (204, 102245), (220, 94809), (221, 94380), (242, 86190), (255, 81796), (260, 80223), (286, 72930), (330, 63206), (338, 61710), (340, 61347), (363, 57460), (374, 55770), (390, 53482), (429, 48620), (442, 47190), (484, 43095), (507, 41140), (510, 40898), (561, 37180), (572, 36465), (605, 34476), (660, 31603), (663, 31460), (676, 30855), (715, 29172), (726, 28730), (748, 27885), (780, 26741), (845, 24684), (858, 24310), (884, 23595), (935, 22308), (1014, 20570), (1020, 20449), (1105, 18876), (1122, 18590), (1210, 17238), (1326, 15730), (1430, 14586), (1452, 14365), (1573, 13260), (1690, 12342), (1716, 12155), (1815, 11492), (1859, 11220), (1870, 11154), (2028, 10285), (2057, 10140), (2145, 9724), (2210, 9438), (2244, 9295), (2420, 8619), (2431, 8580), (2535, 8228), (2652, 7865), (2805, 7436), (2860, 7293), (2873, 7260), (3146, 6630), (3315, 6292), (3380, 6171), (3630, 5746), (3718, 5610), (3740, 5577), (4114, 5070), (4290, 4862), (4420, 4719)]