21217920

素因数分解:

$2^7\times 3^1\times 5^1\times {\mathrm{43}}^1\times {\mathrm{257}}^1$

素因数の和:322

約数の個数: 128

約数和(自身を含む): 69474240

約数和(自身を除く): 48256320

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30, 32, 40, 43, 48, 60, 64, 80, 86, 96, 120, 128, 129, 160, 172, 192, 215, 240, 257, 258, 320, 344, 384, 430, 480, 514, 516, 640, 645, 688, 771, 860, 960, 1028, 1032, 1285, 1290, 1376, 1542, 1720, 1920, 2056, 2064, 2570, 2580, 2752, 3084, 3440, 3855, 4112, 4128, 5140, 5160, 5504, 6168, 6880, 7710, 8224, 8256, 10280, 10320, 11051, 12336, 13760, 15420, 16448, 16512, 20560, 20640, 22102, 24672, 27520, 30840, 32896, 33153, 41120, 41280, 44204, 49344, 55255, 61680, 66306, 82240, 82560, 88408, 98688, 110510, 123360, 132612, 164480, 165765, 176816, 221020, 246720, 265224, 331530, 353632, 442040, 493440, 530448, 663060, 707264, 884080, 1060896, 1326120, 1414528, 1768160, 2121792, 2652240, 3536320, 4243584, 5304480, 7072640, 10608960, 21217920]

約数ペア:

[(1, 21217920), (2, 10608960), (3, 7072640), (4, 5304480), (5, 4243584), (6, 3536320), (8, 2652240), (10, 2121792), (12, 1768160), (15, 1414528), (16, 1326120), (20, 1060896), (24, 884080), (30, 707264), (32, 663060), (40, 530448), (43, 493440), (48, 442040), (60, 353632), (64, 331530), (80, 265224), (86, 246720), (96, 221020), (120, 176816), (128, 165765), (129, 164480), (160, 132612), (172, 123360), (192, 110510), (215, 98688), (240, 88408), (257, 82560), (258, 82240), (320, 66306), (344, 61680), (384, 55255), (430, 49344), (480, 44204), (514, 41280), (516, 41120), (640, 33153), (645, 32896), (688, 30840), (771, 27520), (860, 24672), (960, 22102), (1028, 20640), (1032, 20560), (1285, 16512), (1290, 16448), (1376, 15420), (1542, 13760), (1720, 12336), (1920, 11051), (2056, 10320), (2064, 10280), (2570, 8256), (2580, 8224), (2752, 7710), (3084, 6880), (3440, 6168), (3855, 5504), (4112, 5160), (4128, 5140)]