20688507

素因数分解:

$3^3\times 7^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{137}}^1$

素因数の和:217

約数の個数: 64

約数和(自身を含む): 38154240

約数和(自身を除く): 17465733

約数列:

[1, 3, 7, 9, 17, 21, 27, 47, 51, 63, 119, 137, 141, 153, 189, 329, 357, 411, 423, 459, 799, 959, 987, 1071, 1233, 1269, 2329, 2397, 2877, 2961, 3213, 3699, 5593, 6439, 6987, 7191, 8631, 8883, 16303, 16779, 19317, 20961, 21573, 25893, 45073, 48909, 50337, 57951, 62883, 109463, 135219, 146727, 151011, 173853, 328389, 405657, 440181, 766241, 985167, 1216971, 2298723, 2955501, 6896169, 20688507]

約数ペア:

[(1, 20688507), (3, 6896169), (7, 2955501), (9, 2298723), (17, 1216971), (21, 985167), (27, 766241), (47, 440181), (51, 405657), (63, 328389), (119, 173853), (137, 151011), (141, 146727), (153, 135219), (189, 109463), (329, 62883), (357, 57951), (411, 50337), (423, 48909), (459, 45073), (799, 25893), (959, 21573), (987, 20961), (1071, 19317), (1233, 16779), (1269, 16303), (2329, 8883), (2397, 8631), (2877, 7191), (2961, 6987), (3213, 6439), (3699, 5593)]