81663920

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{149}}^1$

素因数の和:223

約数の個数: 160

約数和(自身を含む): 224985600

約数和(自身を除く): 143321680

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 17, 20, 26, 31, 34, 40, 52, 62, 65, 68, 80, 85, 104, 124, 130, 136, 149, 155, 170, 208, 221, 248, 260, 272, 298, 310, 340, 403, 442, 496, 520, 527, 596, 620, 680, 745, 806, 884, 1040, 1054, 1105, 1192, 1240, 1360, 1490, 1612, 1768, 1937, 2015, 2108, 2210, 2384, 2480, 2533, 2635, 2980, 3224, 3536, 3874, 4030, 4216, 4420, 4619, 5066, 5270, 5960, 6448, 6851, 7748, 8060, 8432, 8840, 9238, 9685, 10132, 10540, 11920, 12665, 13702, 15496, 16120, 17680, 18476, 19370, 20264, 21080, 23095, 25330, 27404, 30992, 32240, 32929, 34255, 36952, 38740, 40528, 42160, 46190, 50660, 54808, 60047, 65858, 68510, 73904, 77480, 78523, 92380, 101320, 109616, 120094, 131716, 137020, 154960, 157046, 164645, 184760, 202640, 240188, 263432, 274040, 300235, 314092, 329290, 369520, 392615, 480376, 526864, 548080, 600470, 628184, 658580, 785230, 960752, 1020799, 1200940, 1256368, 1317160, 1570460, 2041598, 2401880, 2634320, 3140920, 4083196, 4803760, 5103995, 6281840, 8166392, 10207990, 16332784, 20415980, 40831960, 81663920]

約数ペア:

[(1, 81663920), (2, 40831960), (4, 20415980), (5, 16332784), (8, 10207990), (10, 8166392), (13, 6281840), (16, 5103995), (17, 4803760), (20, 4083196), (26, 3140920), (31, 2634320), (34, 2401880), (40, 2041598), (52, 1570460), (62, 1317160), (65, 1256368), (68, 1200940), (80, 1020799), (85, 960752), (104, 785230), (124, 658580), (130, 628184), (136, 600470), (149, 548080), (155, 526864), (170, 480376), (208, 392615), (221, 369520), (248, 329290), (260, 314092), (272, 300235), (298, 274040), (310, 263432), (340, 240188), (403, 202640), (442, 184760), (496, 164645), (520, 157046), (527, 154960), (596, 137020), (620, 131716), (680, 120094), (745, 109616), (806, 101320), (884, 92380), (1040, 78523), (1054, 77480), (1105, 73904), (1192, 68510), (1240, 65858), (1360, 60047), (1490, 54808), (1612, 50660), (1768, 46190), (1937, 42160), (2015, 40528), (2108, 38740), (2210, 36952), (2384, 34255), (2480, 32929), (2533, 32240), (2635, 30992), (2980, 27404), (3224, 25330), (3536, 23095), (3874, 21080), (4030, 20264), (4216, 19370), (4420, 18476), (4619, 17680), (5066, 16120), (5270, 15496), (5960, 13702), (6448, 12665), (6851, 11920), (7748, 10540), (8060, 10132), (8432, 9685), (8840, 9238)]