21085480

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{43}}^1$

素因数の和:131

約数の個数: 128

約数和(自身を含む): 55883520

約数和(自身を除く): 34798040

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 23, 26, 40, 41, 43, 46, 52, 65, 82, 86, 92, 104, 115, 130, 164, 172, 184, 205, 215, 230, 260, 299, 328, 344, 410, 430, 460, 520, 533, 559, 598, 820, 860, 920, 943, 989, 1066, 1118, 1196, 1495, 1640, 1720, 1763, 1886, 1978, 2132, 2236, 2392, 2665, 2795, 2990, 3526, 3772, 3956, 4264, 4472, 4715, 4945, 5330, 5590, 5980, 7052, 7544, 7912, 8815, 9430, 9890, 10660, 11180, 11960, 12259, 12857, 14104, 17630, 18860, 19780, 21320, 22360, 22919, 24518, 25714, 35260, 37720, 39560, 40549, 45838, 49036, 51428, 61295, 64285, 70520, 81098, 91676, 98072, 102856, 114595, 122590, 128570, 162196, 183352, 202745, 229190, 245180, 257140, 324392, 405490, 458380, 490360, 514280, 527137, 810980, 916760, 1054274, 1621960, 2108548, 2635685, 4217096, 5271370, 10542740, 21085480]

約数ペア:

[(1, 21085480), (2, 10542740), (4, 5271370), (5, 4217096), (8, 2635685), (10, 2108548), (13, 1621960), (20, 1054274), (23, 916760), (26, 810980), (40, 527137), (41, 514280), (43, 490360), (46, 458380), (52, 405490), (65, 324392), (82, 257140), (86, 245180), (92, 229190), (104, 202745), (115, 183352), (130, 162196), (164, 128570), (172, 122590), (184, 114595), (205, 102856), (215, 98072), (230, 91676), (260, 81098), (299, 70520), (328, 64285), (344, 61295), (410, 51428), (430, 49036), (460, 45838), (520, 40549), (533, 39560), (559, 37720), (598, 35260), (820, 25714), (860, 24518), (920, 22919), (943, 22360), (989, 21320), (1066, 19780), (1118, 18860), (1196, 17630), (1495, 14104), (1640, 12857), (1720, 12259), (1763, 11960), (1886, 11180), (1978, 10660), (2132, 9890), (2236, 9430), (2392, 8815), (2665, 7912), (2795, 7544), (2990, 7052), (3526, 5980), (3772, 5590), (3956, 5330), (4264, 4945), (4472, 4715)]