21678176

素因数分解:

$2^5\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{41}}^2$

素因数の和:136

約数の個数: 72

約数和(自身を含む): 48629952

約数和(自身を除く): 26951776

約数列:

[1, 2, 4, 8, 13, 16, 26, 31, 32, 41, 52, 62, 82, 104, 124, 164, 208, 248, 328, 403, 416, 496, 533, 656, 806, 992, 1066, 1271, 1312, 1612, 1681, 2132, 2542, 3224, 3362, 4264, 5084, 6448, 6724, 8528, 10168, 12896, 13448, 16523, 17056, 20336, 21853, 26896, 33046, 40672, 43706, 52111, 53792, 66092, 87412, 104222, 132184, 174824, 208444, 264368, 349648, 416888, 528736, 677443, 699296, 833776, 1354886, 1667552, 2709772, 5419544, 10839088, 21678176]

約数ペア:

[(1, 21678176), (2, 10839088), (4, 5419544), (8, 2709772), (13, 1667552), (16, 1354886), (26, 833776), (31, 699296), (32, 677443), (41, 528736), (52, 416888), (62, 349648), (82, 264368), (104, 208444), (124, 174824), (164, 132184), (208, 104222), (248, 87412), (328, 66092), (403, 53792), (416, 52111), (496, 43706), (533, 40672), (656, 33046), (806, 26896), (992, 21853), (1066, 20336), (1271, 17056), (1312, 16523), (1612, 13448), (1681, 12896), (2132, 10168), (2542, 8528), (3224, 6724), (3362, 6448), (4264, 5084)]