21000927280

素因数分解:

$2^4\times 5^1\times {\mathrm{47}}^1\times {\mathrm{59}}^1\times {\mathrm{137}}^1\times {\mathrm{691}}^1$

素因数の和:947

約数の個数: 160

約数和(自身を含む): 51155297280

約数和(自身を除く): 30154370000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 47, 59, 80, 94, 118, 137, 188, 235, 236, 274, 295, 376, 470, 472, 548, 590, 685, 691, 752, 940, 944, 1096, 1180, 1370, 1382, 1880, 2192, 2360, 2740, 2764, 2773, 3455, 3760, 4720, 5480, 5528, 5546, 6439, 6910, 8083, 10960, 11056, 11092, 12878, 13820, 13865, 16166, 22184, 25756, 27640, 27730, 32195, 32332, 32477, 40415, 40769, 44368, 51512, 55280, 55460, 64390, 64664, 64954, 80830, 81538, 94667, 103024, 110920, 128780, 129328, 129908, 161660, 162385, 163076, 189334, 203845, 221840, 257560, 259816, 323320, 324770, 326152, 378668, 379901, 407690, 473335, 515120, 519632, 646640, 649540, 652304, 757336, 759802, 815380, 946670, 1299080, 1514672, 1519604, 1630760, 1893340, 1899505, 1916143, 2598160, 3039208, 3261520, 3786680, 3799010, 3832286, 4449349, 5585353, 6078416, 7573360, 7598020, 7664572, 8898698, 9580715, 11170706, 15196040, 15329144, 17797396, 19161430, 22246745, 22341412, 27926765, 30392080, 30658288, 35594792, 38322860, 44493490, 44682824, 55853530, 71189584, 76645720, 88986980, 89365648, 111707060, 153291440, 177973960, 223414120, 262511591, 355947920, 446828240, 525023182, 1050046364, 1312557955, 2100092728, 2625115910, 4200185456, 5250231820, 10500463640, 21000927280]

約数ペア:

[(1, 21000927280), (2, 10500463640), (4, 5250231820), (5, 4200185456), (8, 2625115910), (10, 2100092728), (16, 1312557955), (20, 1050046364), (40, 525023182), (47, 446828240), (59, 355947920), (80, 262511591), (94, 223414120), (118, 177973960), (137, 153291440), (188, 111707060), (235, 89365648), (236, 88986980), (274, 76645720), (295, 71189584), (376, 55853530), (470, 44682824), (472, 44493490), (548, 38322860), (590, 35594792), (685, 30658288), (691, 30392080), (752, 27926765), (940, 22341412), (944, 22246745), (1096, 19161430), (1180, 17797396), (1370, 15329144), (1382, 15196040), (1880, 11170706), (2192, 9580715), (2360, 8898698), (2740, 7664572), (2764, 7598020), (2773, 7573360), (3455, 6078416), (3760, 5585353), (4720, 4449349), (5480, 3832286), (5528, 3799010), (5546, 3786680), (6439, 3261520), (6910, 3039208), (8083, 2598160), (10960, 1916143), (11056, 1899505), (11092, 1893340), (12878, 1630760), (13820, 1519604), (13865, 1514672), (16166, 1299080), (22184, 946670), (25756, 815380), (27640, 759802), (27730, 757336), (32195, 652304), (32332, 649540), (32477, 646640), (40415, 519632), (40769, 515120), (44368, 473335), (51512, 407690), (55280, 379901), (55460, 378668), (64390, 326152), (64664, 324770), (64954, 323320), (80830, 259816), (81538, 257560), (94667, 221840), (103024, 203845), (110920, 189334), (128780, 163076), (129328, 162385), (129908, 161660)]