256721540

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^2\times {\mathrm{31}}^2\times {\mathrm{37}}^1$

素因数の和:146

約数の個数: 108

約数和(自身を含む): 603819468

約数和(自身を除く): 347097928

約数列:

[1, 2, 4, 5, 10, 19, 20, 31, 37, 38, 62, 74, 76, 95, 124, 148, 155, 185, 190, 310, 361, 370, 380, 589, 620, 703, 722, 740, 961, 1147, 1178, 1406, 1444, 1805, 1922, 2294, 2356, 2812, 2945, 3515, 3610, 3844, 4588, 4805, 5735, 5890, 7030, 7220, 9610, 11191, 11470, 11780, 13357, 14060, 18259, 19220, 21793, 22382, 22940, 26714, 35557, 36518, 43586, 44764, 53428, 55955, 66785, 71114, 73036, 87172, 91295, 108965, 111910, 133570, 142228, 177785, 182590, 217930, 223820, 267140, 346921, 355570, 365180, 414067, 435860, 675583, 693842, 711140, 828134, 1351166, 1387684, 1656268, 1734605, 2070335, 2702332, 3377915, 3469210, 4140670, 6755830, 6938420, 8281340, 12836077, 13511660, 25672154, 51344308, 64180385, 128360770, 256721540]

約数ペア:

[(1, 256721540), (2, 128360770), (4, 64180385), (5, 51344308), (10, 25672154), (19, 13511660), (20, 12836077), (31, 8281340), (37, 6938420), (38, 6755830), (62, 4140670), (74, 3469210), (76, 3377915), (95, 2702332), (124, 2070335), (148, 1734605), (155, 1656268), (185, 1387684), (190, 1351166), (310, 828134), (361, 711140), (370, 693842), (380, 675583), (589, 435860), (620, 414067), (703, 365180), (722, 355570), (740, 346921), (961, 267140), (1147, 223820), (1178, 217930), (1406, 182590), (1444, 177785), (1805, 142228), (1922, 133570), (2294, 111910), (2356, 108965), (2812, 91295), (2945, 87172), (3515, 73036), (3610, 71114), (3844, 66785), (4588, 55955), (4805, 53428), (5735, 44764), (5890, 43586), (7030, 36518), (7220, 35557), (9610, 26714), (11191, 22940), (11470, 22382), (11780, 21793), (13357, 19220), (14060, 18259)]