21573279

素因数分解:

$3^2\times 7^2\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{71}}^1$

素因数の和:157

約数の個数: 72

約数和(自身を含む): 40334112

約数和(自身を除く): 18760833

約数列:

[1, 3, 7, 9, 13, 21, 39, 49, 53, 63, 71, 91, 117, 147, 159, 213, 273, 371, 441, 477, 497, 637, 639, 689, 819, 923, 1113, 1491, 1911, 2067, 2597, 2769, 3339, 3479, 3763, 4473, 4823, 5733, 6201, 6461, 7791, 8307, 10437, 11289, 14469, 19383, 23373, 26341, 31311, 33761, 33867, 43407, 45227, 48919, 58149, 79023, 101283, 135681, 146757, 184387, 237069, 303849, 342433, 407043, 440271, 553161, 1027299, 1659483, 2397031, 3081897, 7191093, 21573279]

約数ペア:

[(1, 21573279), (3, 7191093), (7, 3081897), (9, 2397031), (13, 1659483), (21, 1027299), (39, 553161), (49, 440271), (53, 407043), (63, 342433), (71, 303849), (91, 237069), (117, 184387), (147, 146757), (159, 135681), (213, 101283), (273, 79023), (371, 58149), (441, 48919), (477, 45227), (497, 43407), (637, 33867), (639, 33761), (689, 31311), (819, 26341), (923, 23373), (1113, 19383), (1491, 14469), (1911, 11289), (2067, 10437), (2597, 8307), (2769, 7791), (3339, 6461), (3479, 6201), (3763, 5733), (4473, 4823)]