20721780

素因数分解:

$2^2\times 3^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{73}}^1\times {\mathrm{83}}^1$

素因数の和:190

約数の個数: 144

約数和(自身を含む): 67878720

約数和(自身を除く): 47156940

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 19, 20, 30, 36, 38, 45, 57, 60, 73, 76, 83, 90, 95, 114, 146, 166, 171, 180, 190, 219, 228, 249, 285, 292, 332, 342, 365, 380, 415, 438, 498, 570, 657, 684, 730, 747, 830, 855, 876, 996, 1095, 1140, 1245, 1314, 1387, 1460, 1494, 1577, 1660, 1710, 2190, 2490, 2628, 2774, 2988, 3154, 3285, 3420, 3735, 4161, 4380, 4731, 4980, 5548, 6059, 6308, 6570, 6935, 7470, 7885, 8322, 9462, 12118, 12483, 13140, 13870, 14193, 14940, 15770, 16644, 18177, 18924, 20805, 23655, 24236, 24966, 27740, 28386, 30295, 31540, 36354, 41610, 47310, 49932, 54531, 56772, 60590, 62415, 70965, 72708, 83220, 90885, 94620, 109062, 115121, 121180, 124830, 141930, 181770, 218124, 230242, 249660, 272655, 283860, 345363, 363540, 460484, 545310, 575605, 690726, 1036089, 1090620, 1151210, 1381452, 1726815, 2072178, 2302420, 3453630, 4144356, 5180445, 6907260, 10360890, 20721780]

約数ペア:

[(1, 20721780), (2, 10360890), (3, 6907260), (4, 5180445), (5, 4144356), (6, 3453630), (9, 2302420), (10, 2072178), (12, 1726815), (15, 1381452), (18, 1151210), (19, 1090620), (20, 1036089), (30, 690726), (36, 575605), (38, 545310), (45, 460484), (57, 363540), (60, 345363), (73, 283860), (76, 272655), (83, 249660), (90, 230242), (95, 218124), (114, 181770), (146, 141930), (166, 124830), (171, 121180), (180, 115121), (190, 109062), (219, 94620), (228, 90885), (249, 83220), (285, 72708), (292, 70965), (332, 62415), (342, 60590), (365, 56772), (380, 54531), (415, 49932), (438, 47310), (498, 41610), (570, 36354), (657, 31540), (684, 30295), (730, 28386), (747, 27740), (830, 24966), (855, 24236), (876, 23655), (996, 20805), (1095, 18924), (1140, 18177), (1245, 16644), (1314, 15770), (1387, 14940), (1460, 14193), (1494, 13870), (1577, 13140), (1660, 12483), (1710, 12118), (2190, 9462), (2490, 8322), (2628, 7885), (2774, 7470), (2988, 6935), (3154, 6570), (3285, 6308), (3420, 6059), (3735, 5548), (4161, 4980), (4380, 4731)]