21756280

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{139}}^1$

素因数の和:213

約数の個数: 128

約数和(自身を含む): 62092800

約数和(自身を除く): 40336520

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 20, 26, 28, 35, 40, 43, 52, 56, 65, 70, 86, 91, 104, 130, 139, 140, 172, 182, 215, 260, 278, 280, 301, 344, 364, 430, 455, 520, 556, 559, 602, 695, 728, 860, 910, 973, 1112, 1118, 1204, 1390, 1505, 1720, 1807, 1820, 1946, 2236, 2408, 2780, 2795, 3010, 3614, 3640, 3892, 3913, 4472, 4865, 5560, 5590, 5977, 6020, 7228, 7784, 7826, 9035, 9730, 11180, 11954, 12040, 12649, 14456, 15652, 18070, 19460, 19565, 22360, 23908, 25298, 29885, 31304, 36140, 38920, 39130, 41839, 47816, 50596, 59770, 63245, 72280, 77701, 78260, 83678, 101192, 119540, 126490, 155402, 156520, 167356, 209195, 239080, 252980, 310804, 334712, 388505, 418390, 505960, 543907, 621608, 777010, 836780, 1087814, 1554020, 1673560, 2175628, 2719535, 3108040, 4351256, 5439070, 10878140, 21756280]

約数ペア:

[(1, 21756280), (2, 10878140), (4, 5439070), (5, 4351256), (7, 3108040), (8, 2719535), (10, 2175628), (13, 1673560), (14, 1554020), (20, 1087814), (26, 836780), (28, 777010), (35, 621608), (40, 543907), (43, 505960), (52, 418390), (56, 388505), (65, 334712), (70, 310804), (86, 252980), (91, 239080), (104, 209195), (130, 167356), (139, 156520), (140, 155402), (172, 126490), (182, 119540), (215, 101192), (260, 83678), (278, 78260), (280, 77701), (301, 72280), (344, 63245), (364, 59770), (430, 50596), (455, 47816), (520, 41839), (556, 39130), (559, 38920), (602, 36140), (695, 31304), (728, 29885), (860, 25298), (910, 23908), (973, 22360), (1112, 19565), (1118, 19460), (1204, 18070), (1390, 15652), (1505, 14456), (1720, 12649), (1807, 12040), (1820, 11954), (1946, 11180), (2236, 9730), (2408, 9035), (2780, 7826), (2795, 7784), (3010, 7228), (3614, 6020), (3640, 5977), (3892, 5590), (3913, 5560), (4472, 4865)]