20558720

素因数分解:

$2^7\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{353}}^1$

素因数の和:392

約数の個数: 128

約数和(自身を含む): 60661440

約数和(自身を除く): 40102720

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 20, 26, 28, 32, 35, 40, 52, 56, 64, 65, 70, 80, 91, 104, 112, 128, 130, 140, 160, 182, 208, 224, 260, 280, 320, 353, 364, 416, 448, 455, 520, 560, 640, 706, 728, 832, 896, 910, 1040, 1120, 1412, 1456, 1664, 1765, 1820, 2080, 2240, 2471, 2824, 2912, 3530, 3640, 4160, 4480, 4589, 4942, 5648, 5824, 7060, 7280, 8320, 9178, 9884, 11296, 11648, 12355, 14120, 14560, 18356, 19768, 22592, 22945, 24710, 28240, 29120, 32123, 36712, 39536, 45184, 45890, 49420, 56480, 58240, 64246, 73424, 79072, 91780, 98840, 112960, 128492, 146848, 158144, 160615, 183560, 197680, 225920, 256984, 293696, 316288, 321230, 367120, 395360, 513968, 587392, 642460, 734240, 790720, 1027936, 1284920, 1468480, 1581440, 2055872, 2569840, 2936960, 4111744, 5139680, 10279360, 20558720]

約数ペア:

[(1, 20558720), (2, 10279360), (4, 5139680), (5, 4111744), (7, 2936960), (8, 2569840), (10, 2055872), (13, 1581440), (14, 1468480), (16, 1284920), (20, 1027936), (26, 790720), (28, 734240), (32, 642460), (35, 587392), (40, 513968), (52, 395360), (56, 367120), (64, 321230), (65, 316288), (70, 293696), (80, 256984), (91, 225920), (104, 197680), (112, 183560), (128, 160615), (130, 158144), (140, 146848), (160, 128492), (182, 112960), (208, 98840), (224, 91780), (260, 79072), (280, 73424), (320, 64246), (353, 58240), (364, 56480), (416, 49420), (448, 45890), (455, 45184), (520, 39536), (560, 36712), (640, 32123), (706, 29120), (728, 28240), (832, 24710), (896, 22945), (910, 22592), (1040, 19768), (1120, 18356), (1412, 14560), (1456, 14120), (1664, 12355), (1765, 11648), (1820, 11296), (2080, 9884), (2240, 9178), (2471, 8320), (2824, 7280), (2912, 7060), (3530, 5824), (3640, 5648), (4160, 4942), (4480, 4589)]