21156240

素因数分解:

$2^4\times 3^1\times 5^1\times 7^3\times {\mathrm{257}}^1$

素因数の和:294

約数の個数: 160

約数和(自身を含む): 76780800

約数和(自身を除く): 55624560

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 16, 20, 21, 24, 28, 30, 35, 40, 42, 48, 49, 56, 60, 70, 80, 84, 98, 105, 112, 120, 140, 147, 168, 196, 210, 240, 245, 257, 280, 294, 336, 343, 392, 420, 490, 514, 560, 588, 686, 735, 771, 784, 840, 980, 1028, 1029, 1176, 1285, 1372, 1470, 1542, 1680, 1715, 1799, 1960, 2056, 2058, 2352, 2570, 2744, 2940, 3084, 3430, 3598, 3855, 3920, 4112, 4116, 5140, 5145, 5397, 5488, 5880, 6168, 6860, 7196, 7710, 8232, 8995, 10280, 10290, 10794, 11760, 12336, 12593, 13720, 14392, 15420, 16464, 17990, 20560, 20580, 21588, 25186, 26985, 27440, 28784, 30840, 35980, 37779, 41160, 43176, 50372, 53970, 61680, 62965, 71960, 75558, 82320, 86352, 88151, 100744, 107940, 125930, 143920, 151116, 176302, 188895, 201488, 215880, 251860, 264453, 302232, 352604, 377790, 431760, 440755, 503720, 528906, 604464, 705208, 755580, 881510, 1007440, 1057812, 1322265, 1410416, 1511160, 1763020, 2115624, 2644530, 3022320, 3526040, 4231248, 5289060, 7052080, 10578120, 21156240]

約数ペア:

[(1, 21156240), (2, 10578120), (3, 7052080), (4, 5289060), (5, 4231248), (6, 3526040), (7, 3022320), (8, 2644530), (10, 2115624), (12, 1763020), (14, 1511160), (15, 1410416), (16, 1322265), (20, 1057812), (21, 1007440), (24, 881510), (28, 755580), (30, 705208), (35, 604464), (40, 528906), (42, 503720), (48, 440755), (49, 431760), (56, 377790), (60, 352604), (70, 302232), (80, 264453), (84, 251860), (98, 215880), (105, 201488), (112, 188895), (120, 176302), (140, 151116), (147, 143920), (168, 125930), (196, 107940), (210, 100744), (240, 88151), (245, 86352), (257, 82320), (280, 75558), (294, 71960), (336, 62965), (343, 61680), (392, 53970), (420, 50372), (490, 43176), (514, 41160), (560, 37779), (588, 35980), (686, 30840), (735, 28784), (771, 27440), (784, 26985), (840, 25186), (980, 21588), (1028, 20580), (1029, 20560), (1176, 17990), (1285, 16464), (1372, 15420), (1470, 14392), (1542, 13720), (1680, 12593), (1715, 12336), (1799, 11760), (1960, 10794), (2056, 10290), (2058, 10280), (2352, 8995), (2570, 8232), (2744, 7710), (2940, 7196), (3084, 6860), (3430, 6168), (3598, 5880), (3855, 5488), (3920, 5397), (4112, 5145), (4116, 5140)]