21031725

素因数分解:

$3^1\times 5^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{53}}^1$

素因数の和:127

約数の個数: 96

約数和(自身を含む): 42747264

約数和(自身を除く): 21715539

約数列:

[1, 3, 5, 11, 13, 15, 25, 33, 37, 39, 53, 55, 65, 75, 111, 143, 159, 165, 185, 195, 265, 275, 325, 407, 429, 481, 555, 583, 689, 715, 795, 825, 925, 975, 1221, 1325, 1443, 1749, 1961, 2035, 2067, 2145, 2405, 2775, 2915, 3445, 3575, 3975, 5291, 5883, 6105, 7215, 7579, 8745, 9805, 10175, 10335, 10725, 12025, 14575, 15873, 17225, 21571, 22737, 25493, 26455, 29415, 30525, 36075, 37895, 43725, 49025, 51675, 64713, 76479, 79365, 107855, 113685, 127465, 132275, 147075, 189475, 280423, 323565, 382395, 396825, 539275, 568425, 637325, 841269, 1402115, 1617825, 1911975, 4206345, 7010575, 21031725]

約数ペア:

[(1, 21031725), (3, 7010575), (5, 4206345), (11, 1911975), (13, 1617825), (15, 1402115), (25, 841269), (33, 637325), (37, 568425), (39, 539275), (53, 396825), (55, 382395), (65, 323565), (75, 280423), (111, 189475), (143, 147075), (159, 132275), (165, 127465), (185, 113685), (195, 107855), (265, 79365), (275, 76479), (325, 64713), (407, 51675), (429, 49025), (481, 43725), (555, 37895), (583, 36075), (689, 30525), (715, 29415), (795, 26455), (825, 25493), (925, 22737), (975, 21571), (1221, 17225), (1325, 15873), (1443, 14575), (1749, 12025), (1961, 10725), (2035, 10335), (2067, 10175), (2145, 9805), (2405, 8745), (2775, 7579), (2915, 7215), (3445, 6105), (3575, 5883), (3975, 5291)]