20965725

素因数分解:

$3^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{197}}^1$

素因数の和:267

約数の個数: 72

約数和(自身を含む): 42131232

約数和(自身を除く): 21165507

約数列:

[1, 3, 5, 9, 11, 15, 25, 33, 43, 45, 55, 75, 99, 129, 165, 197, 215, 225, 275, 387, 473, 495, 591, 645, 825, 985, 1075, 1419, 1773, 1935, 2167, 2365, 2475, 2955, 3225, 4257, 4925, 6501, 7095, 8471, 8865, 9675, 10835, 11825, 14775, 19503, 21285, 25413, 32505, 35475, 42355, 44325, 54175, 76239, 93181, 97515, 106425, 127065, 162525, 211775, 279543, 381195, 465905, 487575, 635325, 838629, 1397715, 1905975, 2329525, 4193145, 6988575, 20965725]

約数ペア:

[(1, 20965725), (3, 6988575), (5, 4193145), (9, 2329525), (11, 1905975), (15, 1397715), (25, 838629), (33, 635325), (43, 487575), (45, 465905), (55, 381195), (75, 279543), (99, 211775), (129, 162525), (165, 127065), (197, 106425), (215, 97515), (225, 93181), (275, 76239), (387, 54175), (473, 44325), (495, 42355), (591, 35475), (645, 32505), (825, 25413), (985, 21285), (1075, 19503), (1419, 14775), (1773, 11825), (1935, 10835), (2167, 9675), (2365, 8865), (2475, 8471), (2955, 7095), (3225, 6501), (4257, 4925)]