21191220

素因数分解:

$2^2\times 3^4\times 5^1\times {\mathrm{103}}^1\times {\mathrm{127}}^1$

素因数の和:251

約数の個数: 120

約数和(自身を含む): 67651584

約数和(自身を除く): 46460364

約数列:

[1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 81, 90, 103, 108, 127, 135, 162, 180, 206, 254, 270, 309, 324, 381, 405, 412, 508, 515, 540, 618, 635, 762, 810, 927, 1030, 1143, 1236, 1270, 1524, 1545, 1620, 1854, 1905, 2060, 2286, 2540, 2781, 3090, 3429, 3708, 3810, 4572, 4635, 5562, 5715, 6180, 6858, 7620, 8343, 9270, 10287, 11124, 11430, 13081, 13716, 13905, 16686, 17145, 18540, 20574, 22860, 26162, 27810, 33372, 34290, 39243, 41148, 41715, 51435, 52324, 55620, 65405, 68580, 78486, 83430, 102870, 117729, 130810, 156972, 166860, 196215, 205740, 235458, 261620, 353187, 392430, 470916, 588645, 706374, 784860, 1059561, 1177290, 1412748, 1765935, 2119122, 2354580, 3531870, 4238244, 5297805, 7063740, 10595610, 21191220]

約数ペア:

[(1, 21191220), (2, 10595610), (3, 7063740), (4, 5297805), (5, 4238244), (6, 3531870), (9, 2354580), (10, 2119122), (12, 1765935), (15, 1412748), (18, 1177290), (20, 1059561), (27, 784860), (30, 706374), (36, 588645), (45, 470916), (54, 392430), (60, 353187), (81, 261620), (90, 235458), (103, 205740), (108, 196215), (127, 166860), (135, 156972), (162, 130810), (180, 117729), (206, 102870), (254, 83430), (270, 78486), (309, 68580), (324, 65405), (381, 55620), (405, 52324), (412, 51435), (508, 41715), (515, 41148), (540, 39243), (618, 34290), (635, 33372), (762, 27810), (810, 26162), (927, 22860), (1030, 20574), (1143, 18540), (1236, 17145), (1270, 16686), (1524, 13905), (1545, 13716), (1620, 13081), (1854, 11430), (1905, 11124), (2060, 10287), (2286, 9270), (2540, 8343), (2781, 7620), (3090, 6858), (3429, 6180), (3708, 5715), (3810, 5562), (4572, 4635)]