21505120

素因数分解:

$2^5\times 5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{211}}^1$

素因数の和:253

約数の個数: 144

約数和(自身を含む): 63948528

約数和(自身を除く): 42443408

約数列:

[1, 2, 4, 5, 7, 8, 10, 13, 14, 16, 20, 26, 28, 32, 35, 40, 49, 52, 56, 65, 70, 80, 91, 98, 104, 112, 130, 140, 160, 182, 196, 208, 211, 224, 245, 260, 280, 364, 392, 416, 422, 455, 490, 520, 560, 637, 728, 784, 844, 910, 980, 1040, 1055, 1120, 1274, 1456, 1477, 1568, 1688, 1820, 1960, 2080, 2110, 2548, 2743, 2912, 2954, 3185, 3376, 3640, 3920, 4220, 5096, 5486, 5908, 6370, 6752, 7280, 7385, 7840, 8440, 10192, 10339, 10972, 11816, 12740, 13715, 14560, 14770, 16880, 19201, 20384, 20678, 21944, 23632, 25480, 27430, 29540, 33760, 38402, 41356, 43888, 47264, 50960, 51695, 54860, 59080, 76804, 82712, 87776, 96005, 101920, 103390, 109720, 118160, 134407, 153608, 165424, 192010, 206780, 219440, 236320, 268814, 307216, 330848, 384020, 413560, 438880, 537628, 614432, 672035, 768040, 827120, 1075256, 1344070, 1536080, 1654240, 2150512, 2688140, 3072160, 4301024, 5376280, 10752560, 21505120]

約数ペア:

[(1, 21505120), (2, 10752560), (4, 5376280), (5, 4301024), (7, 3072160), (8, 2688140), (10, 2150512), (13, 1654240), (14, 1536080), (16, 1344070), (20, 1075256), (26, 827120), (28, 768040), (32, 672035), (35, 614432), (40, 537628), (49, 438880), (52, 413560), (56, 384020), (65, 330848), (70, 307216), (80, 268814), (91, 236320), (98, 219440), (104, 206780), (112, 192010), (130, 165424), (140, 153608), (160, 134407), (182, 118160), (196, 109720), (208, 103390), (211, 101920), (224, 96005), (245, 87776), (260, 82712), (280, 76804), (364, 59080), (392, 54860), (416, 51695), (422, 50960), (455, 47264), (490, 43888), (520, 41356), (560, 38402), (637, 33760), (728, 29540), (784, 27430), (844, 25480), (910, 23632), (980, 21944), (1040, 20678), (1055, 20384), (1120, 19201), (1274, 16880), (1456, 14770), (1477, 14560), (1568, 13715), (1688, 12740), (1820, 11816), (1960, 10972), (2080, 10339), (2110, 10192), (2548, 8440), (2743, 7840), (2912, 7385), (2954, 7280), (3185, 6752), (3376, 6370), (3640, 5908), (3920, 5486), (4220, 5096)]